Allen Key H4 H1 C B A C H2 H4 H4 H1 H2 H4 H3 H4 Step 1 Attach chair back (A) with cushioned seat (B). Using 4*bolts (H1) to lock up L/R back legs with Allen key (H4). Fasten in the back of seat frame with 2*bolts (H3) by using Allen key (H4) as shown. Step 2 Assemble legs(C) with seat frame(B). Lock with 4*bolts(H2) by using Allen key(H4).