Instructions
Download a "Flyff" theme and save the archive file on your Windows desktop. "Flyff" themes are contained in zip archive files.
Right-click on the downloaded file on your desktop and select "Cut."
Click on "Start" and select "Computer." Navigate to the following folder:
Right-click anywhere in the window and select "Paste."
Right-click on the archive file. Choose "Extract Here" from the contextual menu. Click on "Yes to All" if a message box pops up, warning you of duplicate files.
Launch "Flyff." The game will now use the new theme you installed in the Theme folder.
C:\Program Files\Gpotato\Flyff\Theme