How do you fix parking pawl on 1993 chev r400?

If it is to loose when you pull the parking brake handle = tighten the bolt that is under the panel that surrounds the parking brake handle on the floor. If it's not the handle there is a wire...

replace entire cable.

how do i remove the seat

That's going to involve taking the trans apart and removing the main gear cluster, the syncro's and blockers are in between the gears. If you are systematic about it you should be able to pull it...

If you have no horn and cigarette lighter, its a fuse.