Okay, you're asking about a cushion plunger, also known as a Berger Button. It has only two adjustments, centershot and spring tension. First, adjust centershot, then adjust spring tension to get the very best arrow flight possible. Pretty simple. They are used most often with flipper rests.

But, if you're gonna be using a release then you'll be using an entirely different type of rest andwon't have any need for one.