You must be logged in to customize a gallery. After logging in, click on any of your galleries and look for the Gallery Tools Menu.
Choose the customize gallery option from the Gallery Tools Menu.
Make a quick setting now to save time later.

Quick settings (in the box along the top) always defaults to set everything manually.
You can create your own quick setting that you can use each time you create a new gallery. Choose save settings below as ... from the pull-down menu in the gray box. Type in a name for your new quick setting. Set your gallery options. Then click save.
Note: Quick settings do not save gallery title, description, keywords, category, subcategory, or theme.
Ok, what are my options?
essentials
Category: Every gallery requires a category, which makes good browsing possible. You can add categories and subcategories to your list!
extras
look & feel

Theme: Scare your admirers with a Halloween theme... Or dazzle them from an ever-growing list. Power and Pro subscribers can create their own themes.
Appearance is for Power and Pro users and controls whether your customized look is used on the gallery pages.
Clean means the gallery description and modified date will not appear on your home page. All categories and subcategories containing a 'clean' gallery will also display as 'clean'.
Camera info places a
photo info icon in the photobar so visitors can pop up a window (example at right) with such details as the date a photo was taken, assuming your camera manufacturer supplies it and you don't strip it out by using the
save for web option with Photoshop.
Have you seen photos with captions like "DSC_0013"? Chances are that's the filename assigned to a photo by a digital camera. If you choose yes to the filename option, your photos will display filenames as captions if there are no captions. If you've entered a caption into your photo's file info field (IPTC caption) with a program like Photoshop, we automatically use it as the caption.
The thumbnails option lets you give your gallery a clean look by automatically choosing a square portion of your image to be the representative thumbnail. This does not affect your original images and you can always switch back. Or, you can zoom the thumbs yourself, if you prefer.
Style lets you force a certain viewing style for your gallery. Example: This gallery is forced to Journal style.
Sort By lets you specify how photos will be arranged in your galleries. If you leave it set at Position, then you can manually arrange them in any order.
security & privacy
Passwords ensure the only people who see your pictures are those you give the password to. More.
Privacy: If you select unlisted, your gallery will not be shown to visitors on your SmugMug homepage. You can send people to your galleries by using one of the sharing options, but no one will find your gallery by using the search or browse features. The purpose is to restrict access to people you invite, without having to use passwords. More.
Hello World and Hello Smuggers are SmugIsland settings. Yes means this gallery will follow the site-wide SmugIsland settings in your control panel. No means this gallery will not be searchable to visitors or appear on Google, regardless of what your site-wide SmugIslands settings are.
External links. Suppose you have a great photo of an iPod in your gallery. With external links turned on, someone can link to your iPod photo to bolster their auction at eBay, generating a lot of views of your photo. If you don't want your photos to appear on forums, blogs, or other Web pages outside of SmugMug, turn external linking off. You need external links set to yes in order to use SmugMug's share emails.
Protected is a Power and Pro feature that thwarts right-click saving of photos.
Watermarking is a Pro-only feature.
Hide owner removes all mention of the owner of the gallery (you!), all links back to your homepage, and any customization power or pro users may have on the rest of their site. This allows you to link a gallery to someone so they can't find their way back to your homepage.
If you'd rather your visitors didn't have access to view your high-resolution original images, select a smaller size as your largest size. Power and standard users can block original, X3L, and X2L by choosing to display XLarge as their largest size. Pro users can block even the large size by choosing to display medium as their largest size.
social
You can turn PhotoRank (voting on your photos) on and off.
You can designate any SmugMug user as friend or family and allow them to edit captions and keywords.
Comments empower anyone to leave jewels like "great shot" or "you stink" on each photo and gallery. You can imagine why some love and some hate this option (and why we put the decision in your hands). Be notified and delete.
Easy sharing gives you a Share button in each gallery. This button leads to a handy page of easily copied urls as well as a great email sharing feature.
printing
photo sharpening - Power and Pro only
This section is only available for Power and Pro SmugMuggers.
SmugMug does not apply any sharpening to your original images, but we do sharpen all the display sizes. This section gives you the power to tweak our sharpening formula.
Changes made to this section will apply to all newly generated display copies. Your photos get new display copies when they are first uploaded, and after they are modified by cropping, rotating, watermarking, or using SmugMug's color effects tool.
You'll find an explanation of these settings here.
Tip: Don't like the changes you made? Change 'em back to SmugMug's default values and do a bulk rotate of all the images in the gallery. We'll make new display copies using SmugMug's default values.
community
Once you've customized to your hearts content, just click Save!