Well, first you want to make sure that you have the right type of ribbon. A nice, thick, shiny ribbon works best. Then you want to start by tying the bow around the tree trunk. You want the ribbon to be loose enough to be able to tie a knot but not so loose that the bow falls off. Then you want to make a loop with the ribbon, and then twist it around again to create another loop. Make sure to pull the loops tightly so the bow doesn't slip off.