Dash pad cap installation

I'm at the point in my 69 Dart resto where I am doing the complete dash while it's out of the car. The original dash pad is stripped of the original ratty cap. Pretty good condition. Years a go I bought a dash cap from Year One or Classic, I don't remember off hand. What is the procedure to put on the new cap and what adhesive would I need. I tried looking for a video on Youtube but didn't find one. I will try to post before and after pics. Thanks.