Craftsman lt1000 won't move

I have a 2009 craftsman lt1000 with hydrostatic transmission that will not move. Some people have told me to push in a wire on the back but there is no wire present. Not helping that there is no information to be be found online for my model number 944.601883 or a tractor with a 20hp Briggs motor.

Help! My grass won't stop growing!!