It's probably due to my shoddy description. You put your fingers into the touch typing homerow. Shift your left hand enough for the edge of your palm to be above the ctrl key. It might also be the base joint of your pinky, depending on the size of your hand. Now press that side down enough to activate the ctrl key while keeping your fingers on the homerow. It's like having an eleventh finger to control the keyboard.

I feel like i'll get carpal tunnel if i do this five times lol, your hands might be a lot smaller than mine