The first thing I’d do is contact the seller and see if they offer some instructions. Maybe they forgot to include them in the package. Each seat cover goes on differently, just depending on who manufactured it, and how it was designed to go on.

I’ll just assume its for a car (not a truck or suv). All rear seat covers I’ve seen from other manufacturers (and including us), require the back seat be removed in order to install.

If the backrests of the back seat fold forward, you should be able to install that portion without removing it. The bottom cushion on most vehicles can be removed by simply pulling up on the cushion. These will be held in by clips making it easy to take out and put back in. If it doesn’t come out by pulling up on it, then there will be two bolts that hold it in. These bolts are normally found on the front portion of the bottom cushion (might need to pull the cushion up a bit to see them). The other location where they could be is in between the crack of the seat.

After you’ve removed the bottom, you’ll install the cover using their method of anchoring it down. Then re-install.

As for your front seat with the arm, that is the gamble you make when ordering universal fit covers. Universal sized covers are made to fit a wide selection of vehicles, which won”t take in effect armrests, integrated seatbelts, or side airbags. So if you have one of those, you have to find some way to rig the cover to work.

Hope this helps. If you want to email me with your vehicles year make and model, I might be able to further assist you with what your vehicle has, and how to go about getting your covers on. My email is thecoverman@yahoo.com