STEP 5
1.
Attach upper back board (8), middle back board (10) and lower back board (11) together
by sliding into plastic connection strips (9).
2.
Attach upper back board (8), middle back board (10) and lower back board (11) to cabinet
by inserting 20 screws (J) through holes on back boards (8, 10 and 11), then tighten to
cabinet.