Harold, This answer is assuming you want the seat to move back further from steering wheel. Track assy. may be seized/gummed up with debri and seat and track may have to be removed to clean and freed up and lubricated to get it to slide all the way back. Links below maybe of help in the repair of your seat and if not leave your question open for more input from other ifixit volunteer's. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
https://www.youtube.com/watch?v=JH4X3IBAu-Q
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