The handle from the previous door must be removed and attached to the new door. If you only want to do this once, make sure when reattaching the old handle/bracket that it is aligned left-to-right and is parallel to the edge of the new door. The holes in the new door are large enough that the door will be skewed if not well aligned. Pay particular attention to the bottom corners once installed as they MUST clear the sides of opening or you may be purchasing yet another door/glass.
No torque specifications were given for reattaching the handle screws. Be careful. A good hand snug seemed to work, but my hand snug may be different than yours.