Andymon,
Okay, here goes, your hitch consists of two main parts not counting the bars. 1. the stinger which slides into the receiver on the truck. 2. the part that the ball is attached to. On mine the stinger has a number of holes to allow for the ball to be mounted at the proper height. Between part 1 and part 2 there is places for spacers to be inserted and locked down with the square headed bolt located below the ball. Clear as mud?
With the stinger installed in the truck and the ball mounted at the correct height you would set the angle of the ball at the desired degree of angle.
If you are like me you will have to print this out and take it out and look at your hitch while you read it. I had to go outside and look at it three times while trying to explain it
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Hope I haven't confused you. Let me know if it is clear.
Richard