Unlock the futon frame. Some futons have a peg which you need to remove from the peg hole. Other futons have a lever you pull to release the lock. A final type of futon frame has an internal spring that you unlock by rocking the back of the frame up, back down, and then back up again.
Move the back of the futon frame to the desired sitting position. Although most futon frames can extend to a full vertical position, it is generally more comfortable to set the back of the frame at a slight angle.
Lock the back of the futon frame at the desired angle. If your futon frame has a pin locking system, reinsert the pin in the pinhole. If your futon frame has a lever, push the lever into its locked position. Futons with spring locking systems will automatically lock in place when released. Your futon is now ready to use as a sofa.