With a wrench, bolts (s), and nuts (t) attach the metal connection (q) piece to your wooden mattress base (R).  Make sure to position the wooden mattress base (R) at a safe and sturdy location on the legs. Take the bolts (f) and insert them into thread inserts on the legs. Tighten securely with an Allen wrench (c). Make sure the surface of your mattress is facing upwards.