You have mounting brackets that bolt on to the fenders. You have to unbolt the brackets, straighten them out and then mount to the flair. You then remount the whole assembly to the fender.
It is most likely that in taking the brackets off, you will break the stud, as the studs are thin. They rust easily and the nuts sieze. If you PB blast them for a couple of day, you just might get them off. If they breake, you can either weld new studs on, drill out and fasten other studs in or purchase new ones from the dealer (about $20 ea).
Mine have been on and off about 3 times, so to make it easier to remove each time, I initially slipped grease packed plastic tubeing over each stud.
Them popping of is one of the reasons a lot of guys leave them off. Guess I'm just not as lazy as I prefer to have them on.
The likelyhood of your just popping them on and them staying on are rather slim.