Remove the mattress from the crib and set it aside.
Locate the screws in each corner of the footboard, mounted to the front of the crib. There are six screws, one in each corner and one in the center of each side of the rail.
Remove the screws in the corners of the footboard with a hex wrench. Remove the footboard from the crib and set it aside.
Remove the four screws securing the mattress support with a hex wrench. Lower the mattress support to the lowest position and secure it by replacing the screws in each corner. Tighten the screws completely with a hex wrench.
Insert the mattress onto the mattress support.