To find the two-handed backhand grip and explain it easily, we are first going to assume that you are right handed. First, grip the tennis racket handle with your right hand so that your heel pad is resting on the first bevel (the top) of the handle. However, your index knuckle is going to rest on the second bevel, one bevel over from the top.
Now place your left hand on the handle. You want the heel pad of your left hand to rest on the seventh bevel. The index knuckle should also rest on the seventh bevel. If you were left handed, this would be an eastern forehand grip. The real key to the two-handed backhand grip is that you want to be holding the racket in a way that allows both arms to move smoothly throughout the shot.