For those confused, go to the User folder on in your Finder. This can be found under Users, then go into the user for the account you're on on your computer. THATS where the hidden Library folder is. So while viewing your user folder, which should have some folders like Documents, Movies, Downloads, Pictures, etc, you use the hotkey combo Command + Shift + . (the period key) which will show a bunch of hidden folders including the Library folder. The go to Library/Application Support/Godot/app_userdata/PNGTuberPlus/  as sandrinas_art said