2012 Ford Fusion seat won’t move

2012 fusion driver seat will not move. Switch clicks. How to determine if switch is bad? Where to buy? How much

Given these 3 questions you’ve asked, I shall guess that you are not a DIY mechanic because testing switches is easy, the parts come from Ford and how much depends on who does it and where you live.

And good automotive repair shop can diagnose this and repair it.