Changes do not Save!!

Trying to modify the Fixer theme, but none of the changes I make are saved, even after pushing Save (both right-click method and control panel). I researched this and people were talking about having to modify something on the server-side? Firefox gives me the "This page is asking you to confirm that you want to leave - data you have entered may not be saved." pop-up. I've installed it in a subdirectory of a Bluehost shared hosting platform. Any solution to this?