step 1. go to folder app
step 2. find 3 TB Drive (F:)
step 3 find game folder
step 4. find steam folder
step 5. find steamapps folder
step 6. find common folder
step 7. find geometry dash folder
step 8. find resources folder
step 9. paste the mod in the resources folder
final step 10. run geometry dash


link to the geometry dash folder F:\Games\Steam\steamapps\common\Geometry Dash