How do you load a shotgun?

Usually, there is a floor plate area just in front of the trigger mechanism, ahd you slide the shells in there one at a time with the brass toward the trigger; that's in a pump gun. Remember, it will only hold 3 shells in the magazine, but go ahead and pump it once, and you can put another in the mag, thus having 4 usuable shells in the gun. Obviously, if it's an over/under, or side by side, you have to break it open and slide the shells in one at a time.