Please refer to instructions step 4 and 5 in the instructions file:
Step 4. Handing of the Internal Lever
a. Rehand the lever (if necessary), by pushing the retaining plate inside the
furniture as shown. (Push through the hole on the same side as the lever.)
b. Then swing the lever up and over to the other direction.
Step 5. Handing of the External Furniture
a. Rehand the lever (if necessary), by pushing the retaining plate inside the
furniture as shown. Push through the hole on the same side as the lever.
b. Then swing the lever up and over to the other direction.