Just look down there and look at the bolts, use a ratchet to loosen the corresponding bolts. Shouldn't be hard to identify which ones they are. To tighten them back and get the proper tension you need, use a crowbar to apply that to the needed component by using leverage, and tighten the bolts back up while applying that tension. If the belts squeak, they may be too loose or too tight, so adjust them accordingly using the described methods.
This should be as good as a DIY for ya!