How many of you use a clicker button????
and if you use one how do you install it

I use a clicker on my Hoyt Buffalo and have the clicker attached to the back side of the riser, works great for me.

I mount mine a few inches below the upper limb tip. I replace the chain with cord so it won't mar the limb.

I have used one for 24 years now.  Go over to the Shooters Form Forum, there are some tutorials and pics there for setting one up.