Using bolt (A) attach part (2) into part (1) with hex key (D) as per diagram.
Using bolt (B) attach part (3) into part (2) with hex key (D) as per diagram.
Using bolt (A) attach part (6) into part (5) with hex key (D) as per diagram.
Using bolt (B) attach part (7) into part (6) with hex key (D) as per diagram.
Put part (4) as per diagram.
Using screw (C) secure part (4) into part (5) with Philips head screwdriver as per diagram.