You need to go to Xemu's settings folder in order to remap your keyboard if you want to and to backup your SD Card emulation image file.

If you already uninstalled it or want to do it by hand.

• On Windows goto File Explorer and copy the following into the address
  bar: %appdata%\xemu-lgb\mega65
• On Linux look into:
  ~/.xemu-lgb/
• On Macintosh:
  ~/Library/Application\ Support/xemu-lgb/mega65/