is the seat stuck and no forward or back movement ?
have looked under and see if anything jamming it ?
if it is dirty and just need cleaning, take seat completely out of car and flip around and get a brake part cleaner can and clean it.
if the track is broke you can try to repair after you take out and see what broke
or you can get another seat from junk yard if it is beyond repairs
Let me know if you need anything else on it just reply back and we can contiunue , if you need diagrams or R & R procedure, but if you are good , Please Kindly rate me.
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ASE Certified Technician