Putting drive belt back on

Steve from Mesa, AZ. 1996 Mercury Grand Marquis 4.6L. Hello, i had to remove the alternator to get to the heating hose underneath the intake manifold. Anyways, i've started putting everything back together and i cannot figure out how to release the tensioner to allow me to slip the drive belt back on. I have a Haynes manual for Ford Crown Victoria and the Mercury Grand Marquis but it doesn't show how to do that for this particular model. I have the right year manual. It gives me directions for a different kind of set-up then the one my car has. The illustration is even different. In my car the alternator is set up in the center of the engine compartment right above the water pump. The tensioner is shaped like a bowling pin with a pulley on the smaller end and is to the left of the water pump. Book says something about slipping a socket wrench on one of bolts and lifting up to release the tension but that just doesn't work for my set-up. There's no big bolt on the bowling pin shaped tensioner. There's a square hole in the center of the tensioner, and a hole in the center of the pulley on the end of the tensioner. That's the best i can do with descriptions. Hope you can help and thank you for any advice.