Assembly instructions are usually included in the shipping box, but if you need an online copy or want to watch an instructional video, read below.
Most of the futon frame bodies are standard and have the same assembly process for all sizes.
Strata Furniture
Pre-built frame assembly (video), KD frame assembly (video).
Wallhugger is a patented mechanism that allows you to open and close the frame without moving it from the wall. Watch how to operate it here.
Prestige Furnishings
Kodiak
Futon body, Arms and stretchers assembly (video).
Lifestyle Solutions
Bi-fold frame assembly, Lounger frame assembly.
Lifestyle uses a front-load mechanism on most of its frames. Watch how to operate it here or here.
J&M Furniture
J&M uses a back-load mechanism on most of its frames. Watch how to operate it here or here.
Night&Day Furniture
Please refer to the product description.