On the HOUSING  looking at from the top to the floor over the frame you may see some holes,  , look for  bolts that adjust there will be two. one for up/down is that not horizon vertical is left right.  I forget
 
before you start turning I mark it.  go on a flat surface and start adjusting  a turn at a time till right.  I also  maybe use a  board or wall to get a better shot at it. I can demo but NOT going to adjust things