2012White5.0

Ok well Mass air meter has been making a noise, basically a high picked whistle, and every once and a while it will throw a cod for it. Mechanic said it was bad, so ordered a new sensor. Now I have a new sensor for it but I cant seem to get the two screws out. I try to take them out and all they do is just spin and wont back out. I dont know what to do to get it out and replace the sensor.