jelqing pressure

Hey all you gainers. I have a question and things to say. I feel typically when jelqing is explained no one explains where to apply pressure and what the effects are. For example I know you use an OK sign but when doing that do I apply even pressure all the way around the penis? Or apply most of the pressure on the sides? And what are the effects of these like more girth or length than another technique?

All the way around
The point is to force more blood into your penis, and make it kinda balloon up
It's going to give you girth more than length, but I'm pretty sure some guys gain a little length.