how do i replace a seat switch on an Ariens riding lawn tractor?

I have an Ariens model 915131 and am needing to replace the seat switch. I have the replacement part, but cannot figure out how to remove the old one in order to replace it. I am not exactly handy but can handle medium level tasks. The person I rely on is not available for a while and I thought maybe I could do it myself, especially since my grass is not waiting on me. Thanks for any help you can give.
Mike