See if you can get a couple pic of the underside of that driver seat.
For now to get power to the seats, you'll need to add a fused circuit from your power distribution box, and run wire to the cab. Then you'll need to locate the power and ground wires on the seats. The harness heads you'll see on the bottom of the seats would of course be bypassed in favor of direct wire splices.
Basically all the seats need is power and ground, But since you are adding them to a Ranger, you will want a separate power source that is fuse protected.
I recommend focusing on determining which wires are which and testing the seats function as step one if your interested in doing this.
Which brings us back to your first post, in which you were asking how to do this in the first place.