Hold the loader in your left hand, and press the adapter lock with your thumb. With your right hand, hook the Mag Adapter into the top of the Lightnin’ Grip Loader and swing the bottom into the slot. Take your thumb off of the lock button. it should pop out to the locked position when the adapter is in fully seated.
Insert your magazine into the adapter until it latches into notch.
To remove the magazine, while holding like pictured here, gently press down on latch and pull out.