I had to take of several on mine to get at the area behind them. I put a putty knife flat on the surface and then took a very small - like 1/2" wide - mini-prybar that I had and worked it under the edge of the button on top of the putty knife. Popped it right off. There is actually a metal snap inside the button like you'd find on a jacket or coat. The putty knife protected the material alongside the button from damage.
2015 Forester 2301 - Chevy
Skip & Deb - Denmark, ME & Delray Beach, FL