First off, do not pay the 20 some odd bucks that the company wants for its product. It has a faulty design and mine was not even working when I took it out of the package and followed the instructions. You can get it at Big Lots and other bargain stores for about $5.
When mine didn't work out of the package, I looked up a YouTube video on why this was and based this 'ible after my findings which can be viewed here.
Step 1: Remove Screws
Turn the launcher over and remove the top half of the frame.
Step 2: Remove Loading Safetey
Step 3: Remove Underwater/Downward Safety
Step 4: Putting It Back Together
When the trigger and barrel have been put back it their slots, take the other half of the frame and fit it over the top.
Turn over and replace the 7 phillip screws.
Your launcher will now be able to be loaded without hitch and fired wherever and whenever you want!