I. Align the left and right arms (#4,5) to the pre-drilled holes along the sides of the backrest with backrest with legs (#1) and seat (#2). II. Insert screw (#H) into the top pre-drilled holes of the arms. III. Prepare 2 bolt assemblies by FIRST inserting the lock washer (#E) onto the bolt (#C) then the flat washer (#F) onto that SAME bolt (#C). Insert to lock arms with seat and secure using the Allen wrench (#G).