Remove the mattress and the mattress support from the portable crib. Fold them, and set them aside.
Push in the silver button on a side lock, and turn the side lock toward the arrow that points to "open." The side locks are on the rail's top. Push the side rail toward the crib's middle to fold it down
Move to the other side of the crib. Push in the silver button on that side's side lock, and turn the side lock toward the arrow that points to "open." Push the side rail toward the crib's middle to fold it flat.