I received a Sustainer unit and a distortion Generator. How do I hook them up RIGHT!!. The manuals online are rather strange to me, showing guitar input on the back??? looking for help. Guitar into front of a unit, out to another unit and run it into my power amp. Thank you for all your help

please tell me the exact hook up I need. Again, guitar into one unit, out to another unit, and into a power amp thanks so much!!