It's very easy. Since XYplorer is a portable application you don't need to do any uninstalling or installing.
Remarks
The application folder is typically C:\Program Files\XYplorer (64-bit) or C:\Program Files (x86)\XYplorer\ (32-bit), and the application data folder typically %appdata%\XYplorer. The easiest way to go to those folders is by menu Go | Go to Application Folder and Go | Go to Application Data Folder inside XYplorer.
The application data folder is typically defined by an entry in the file Startup.ini (located in the application folder). It will probably look like this (64-bit):
[Appdata] Path=%appdata%\XYplorer64
... or like this (32-bit):
[Appdata] Path=%appdata%\XYplorer