[header] How to put a futon together [title] Check to make sure you have all the parts you need. [step] If you have the assembly guide for your specific model, it should tell you all the different parts you'll need. Usually, there will be 2 stretchers, a seat deck, a back deck, and arms. 
Additionally, there will be some variation of screws, dowels, clevis pins, barrel nuts, cotter pins, brackets, sliders, and an allen wrench. [title] Connect the stretchers to the arms to assemble the frame.