I am attaching belt routing diagrams and diagrams that show how each tensioner, there is one per belt, works.
Simply loosen each adjusting bolt, you may have to loosen the hinge and/or flange bolt to get it to move, and loosen it until the belt can be removed. Installtion is same in reverse. Tensision on belt should have a little deflection as it should deflect about a contimeter when strechted. So, you will have to check them the first few hundred miles and tighten them up again after they stretch out.