Belt Tention please help

Can anyone help me find out how to tighten the tention the Power steering belt. I believe this is the 307 buick engine in the 1987 Brougham Please help

Look at the brackets that hold the pump you will see bolts that must be loosened and what is required to move the pump and tension it, or go to autozone.com, repair guides. BTW this is 307 Olds I believe.