Lifted off the door, unscrewed all sides of the door attached the handle to the new trim, and screwed everything back together. It at first was not obvious how to remove the old trim, but the trick was to unscrew all sides of the door (bottom, top and on each side). The door just lifts right off easily. Then you unscrew the old trim and screw in the new trim (be sure to attache the handle first!), and then reinstall the sides and front glass by sliding into place and put back all the screws.
Then slide back on the repaired door.