Wrapping for the uncut
It sounds obvious, but the wrapping technique for the uncut penis is exactly the same as that for the cut penis. However, the way to set up the same kind of wrap is different as the skin of the uncut penis must cover the glans under the wrap, which implies that when you pull the glans, before starting to wrap, you have to do it with its skin covering it and grab your shaft in the same way you do when dry jelqing (if you are uncut and do not know how to dry jelq you should not even try to hang). The way I go about it is: I dry jelq for a few strokes and when I start building up some blood ahead of my Ok grip, I pull up to about a half of an inch before the glans and, holding the grip with the left hand I start wrapping from there down.
Perseverance wins