Antonym of "advance"
Advance is awkward in that context. Simply say, "Go to the next page." The opposite is "Go back to the previous page."
The classic antonym of advance is 'retire'. It's usually used in a military context, but can be used in other ways. It's not normally used of going back a page, but it would be understood. "Go back" would certainly be simpler.
"Return" seems to be appropriate for the context you describe.