How do tu borrar clubes tu have made?

I'm not sure if tu can, o how to, but if tu no longer want to be associated with it tu can still unsubscribe to it. Just go to the clubes section on your profile, find the club and hit unsubscribe. The club will still be there but you'll won't be a part of it anymore.

reportar it.

I think there's no such a thing as a "Delete club" button.
But, tu can reportar it o ask people to reportar that club.
Then it will be surely gone.