>>2938916
Loosen nuts 1, 2, and 3 one-half turn
Pull down gently on the trap until the section going into the wall at nut 2 is generally level.
Tighten nut 1
Adjust the trap until the section under nut 1 is generally vertical and the section going into the wall is 90 degrees (more or less) to the wall.
Tighten nuts 2 and 3.