once again i rely on TR to help me, i voulteered to help a girl change the belt on her 1997 Trans Am. basically i know nothing about Lt1's or Ls1 which ever it is. how do i loosen the tension to remove the old belt?

i know its prolly purdy simple but i have never messed with these engines. all i know is i couldnt see a belt tensioner like my ford has and i have no clue how to get that damn belt off.