- Click the "Install BepInEx" button in the app if you haven't already.
- Launch then close the game after it's done loading.
- Click the "Open BepInEx Folder" button in the app and open the Plugins folder.
- Drag and drop the .dll file of the mod.
- Launch the game and enjoy the mod!
While I can't make a tutorial here in just text, there are plenty of tutorials on Youtube.