musclecarman92,

Make a loose fist with the hand that you use to hold your bow, and then extend that arm, but don't lock your elbow. Your hand, arm, and shoulder should be fairly relaxed.

Now look and see where your top knuckle is pointing. Rotate you extended hand slightly both to the left and to the right, and you'll feel slight amounts of tension build in either your arm or shoulder whenever you rotate your hand out of its "nature pointing" position. That natural hand position should be the same when you're holding your bow, and that's what dictates the amount of cant.