These aren't things that have manuals. You have to think about it: the rear switch needs to be the only one that turns on the laser, which means the side-switch must be disabled. In other words, the side switch needs to be soldered so that it is always on.
You've gotta be able to figure these things out. Look on Google, etc. Even the above operation can be found via a search on Google (hint: "bypass side switch"). Some things have no guides, so you'll have to think about how to do them yourself. If that's too much you shouldn't be working on lasers.