you put the two extensions together, and use the square side IN first. Remember, you put the rod in on an angle. Theres a notch in the bumper, then to the right of that, behind it, should be a painted guide ring, so you will angle the rod in that direction, then feel around until its in corretly. Then you use your tire iron to make a crank on the other end of the extension, and begin to lower the cable down counter clockwise.
Its really a PITA if you were to pop a tire in the rain or on the highway, and then you have to do all this, and climb under the truck to get the spare off of the cable.
Thats why I am a fan of chaining the spare in the truck bed lol.
Problem is with my 32" tires, the damn spare takes nearly a quarter of the truck bed when laid on its side lol.