If the beams are crooked, use your hand and turn the projector before sealing them up. Of course, if the beams aren't at the right height, use the adjusters on the headlight bracket.

You can also make small adjustments if the beams aren't exactly straight once they're sealed. Just turn the hold down nut, and the whole projector will move a bit either way.

If your beams are like this /\ or like this \ / , you have bigger problems and will probably have to do more trimming to the shroud.