put a wrench on the nut that's holding the tensioner pully in place and PRY it one way or the other....it'll kind of swing one way or the other.. you'll have to hold against the spring tension hard enough that it gives you enough space to pull the old belt off and put the new one on a longer wrench = more tortion & less work ;)
go to a napa store they have these diagrams in their belt book
loosen adjuster bolts and take off belt......
You'll find an idler/tensioner pulley, which rides on an adjustable arm. First you have to loosen the locknut(14mm?) of the pulley , then tighten/loosen the adjuster rod (8mm?) to adjust the belt tension. Afterwards, tighten the locknut.
It should have a spring loaded automatic tensioner, if the spring is broke replace the tensioner arm assembly
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