If you have the permissions granted by your club owner, go to the create custom course button. You will have to delete a custom course before you can add one. You can only delete a custom course that you have personally made. You can not delete a custom course that is currently active. If that doesn’t work, maybe the owner is the only one that can delete a custom course that someone else has made.
You will see the trash can icon on far right if you have the ability to delete.
Hal