Using bolt (B) secure L type connector (C) into parts (3,4) with hex key (D) as per diagram.
Using bolt (B) secure L type connector (C) into part (2) with hex key (D) as per diagram.
Using bolt (B) secure part (5) into parts (3,4) with hex key (D) as per diagram. please do not fully tighten the bolts when assemble this step ,otherwise it may caused the next step can not be assembled.
Using bolt (B) secure L type connector (C) into parts (2,3,4) with hex key (D) as per diagram.
Insert wooden dowel (A) into part (1) ,using bolt (B) secure L type connector into parts (3,4) to part (1) with hex key (D) as per diagram.
Adjust any parts out of alignment and tighten all bolts.