Racheal, the pedal on the left is the brake. The mower won't move with the brake on. First see if there is a tree branch caught in the linkage. Most likely to be on the right side under the GO pedal. If you can pull the left pedal up; you may have a broken or disconnected spring (also on the right side ). Also, your brake may be jammed. It can be easily removed by loosening 2 bolts. The brake is located outside the transmission on the right side.
Byron N. Bozeman, September 2007