AppData is a hidden system folder, C:\Users\*****\AppData\Roaming\RenPy (where the asterisks are is where your username would be).Where is this Appdata/roaming/RenPy ?
To access it on PC goto Settings, (right click on start) click settings and in the search bar type "control panel", click that and look for "File Explorer Options" click that, select the "view" tab and select "show hidden icons" click apply/okay and it will show any and all hidden files and folders when you open a folder.