What kind of directions do you need?
How to put the VT3 into the mount? Take it out of the factory wrist band by heating in warm water and pry out with your hands. Then, "pop" it into the DSS bungee mount. You'll see the cutouts on the sides for the interface cord and the side button, so it goes in only one way.
Stringing the bungee? Here's how I did it. I tied an overhand knot in one end of the bungee and feed it down the lower, left hole and then back up the upper, left hole. (This formed one wrist loop.) Then the bungee goes around the top circumference of the computer and down the upper right hole. You'll notice that there are two sets of holes on the right side. I don't use the upper middle hole. As to the lower two holes, the bungee comes up the lowest right hole (forming the second wrist loop) and then turns 180 degrees goes down the lower middle hole and terminates in an overhand knot. The 180 bend holds the bungee, but allows me to pull of the free end or the loop to adjust the tension, especially as between my drysuit, my wetsuit and my diveskin.
I hope this helps.