What does it mean when FEE is in the view finder

FEE means that your lens is not set to the smallest aperture setting. If you are using your camera's auto-focus mode, the lens must be set to the smallest aperture setting which, on your lens, is probably f22 (the smallest aperture is the largest number). Once you set the lens aperture, you should slide the aperture lock to the locked position. The aperture lock is located just right of your largest setting f3.5. This slider should line up with the orange line. To verify that the latch is engaged, try to change the aperture by rotating the aperture ring. In the locked position, the ring will not turn.