In each of the four bed posts, insert one of the supplied dowels (D) into both the top and bottom pre-drilled holes and screw one of the threaded bolts (E) into each of the middle holes (see image 1).
Line up the three holes on each end of the two long sidebeams (see image 2) and use the supplied half-moon washers (B) and nuts (C) to safely connect everything together (see image 3). It may be easier to attach washer & nut, when side rail and post are not fully pushed together.
Once the main frame is assembled, spread the slats out evenly between the two side beams so they are safely resting in place. Then secure to the frame using the supplied cross-head screws (A) with a cross-head screwdriver.