If the motor is working but the seat does not move the gear motor or seat track might be stripped. Guessing the gear on the motor is stripped at it may be plastic.
The seat is held in place by only four bolts, one at each end of the two tracks. These may be hidden by a plastic cover the pops off. The seat wiring harness will unplug. You can remove the seat to take a look.
The forward/reverse motor is the one closest to the dashboard.