I am using bojotes fs9.cfg file and F2 does not engage reverse thrust, is there anything I can do?

FYI, F2 isn't exactly a reverse thrust key, it's just assigned to "decrease throttle quickly" by default. Once the throttle is past idle it becomes reverse thrust. So it's possible it's set right and you're not giving it enough time, (having the throttle at idle before you start holding F2 will help a lot, the higher the throttle is the longer it'll take) or that the keybinding was changed. So co into the keyboard assignments, find Decrease Throttle Quickly, and see what it's set to. If it's not what you want, then change it. :)"Let me help you out. You're cleared to taxi any way you can to any runway you see."

If you are using a Yoke/Stick with a Throttle, make sure it's set to Idle first.