With Website Builder, you can sort photo galleries by the date on which they were created, by gallery name, or manually set the gallery order.

To Set Gallery Display Order in Website Builder
Software Tool Video
Log in to your Account Manager.
Click Website Builder.
In your Website Builder Account list, click Manage next to the account you want to modify.
Click Photos and Videos.
From the Galleries menu, select Edit Galleries.
Click Change Gallery Order.
Select one of the following:
Date created (oldest first) — Lists galleries in order of date, with the oldest gallery displaying at the top of the list
Date created (most recent first) — Lists galleries in order of date, with the most recent gallery displaying at the top of the list
Name (A-Z) — Lists galleries in alphabetical order, with "A" displayed at the top of the list
Name (Z-A) — Lists galleries in alphabetical order, with "Z" displayed at the top of the list
Manually set gallery order — In the Order column, set the numbered position in which you want each gallery to display