How to connect an old subwoofer to a new amp/receiver?

I surprised myself through my wife with a Yamaha 7.2 receiver for christmas. It’s not in use yet, but when it will be, I want to know how to connect my old subwoofer which has only two “hole” in it on its backside to my new amplifier. The output from the amp is coaxial, and the subwoofer holes are made for “blanked” cables. (Only for the copper wires without plastic coating.) I hope I’m clear enough… :)
Thank you