how do i replace the serpentine belt on a acura tl?

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The tension pulley is the way to go. It is VERY tight and hard to budge. The bolt doesn't actually loosen, but the pulley moves inward towards the back of the car. You will probably need to put a bar on your wrench to get the proper leverage, as it has a lot of tension.

i took the power steering pulley off and the belt loosened right up

Put a ratchet/socket (14mm, iirc) on the tensioner pully bolt with a breaker bar or long piece of pipe. Push the tensioner back (toward the trunk) using the breaker bar/pipe for leverage. Remove the belt from the nearby Power Steering Pump Pulley. Release (gently) the tensioner pully and remove the belt. Replace with the new belt in the same manner. Reference the belt routing on the Gates Belts web site if necessary.