A Quick Modding Setup Guide:
- Download the MelonLoader.Installer.exe installer from https://github.com/HerpDerpinstine/MelonLoader/releases
- Run it, and select Spin Rhythm in it's steam directory (the default is C:\Program Files (x86)\Steam\steamapps\common\Spin Rhythm\SpinRhythm.exe)
- Drag the .dll file above into the Mods folder in the game's directory. (for example: C:\Program Files (x86)\Steam\steamapps\common\Spin Rhythm\Mods
- Run the game as you would normally and the modloader will do its thing.