How do you unbind blades on a Garbage Disposal Unit?

Two ways. On the bottom of the disposal in the center there is a hex shaped hole. A rod came with the disposal for that purpose. It may be under the sink somewhere. Insert the hex key and wiggle back and forth.

Second way, use a wooden broom handle or similar, put it in the disposal and gently pry against the blades using the opening in the sink as the pivot point. Pry both ways and you can usually get it loosened.