Extend the recliner and flip it over to gain access to the underside of the foot rest. Notice the bracket that connects to the foot rest and evaluate whether the screws can be tightened or if the screw holes are stripped and require replacement screws.
Tighten the screws using the proper type of screwdriver. If the screws do not tighten, remove them completely.
Replace the old screws that would not tighten with slightly longer wood screws. Do not use too long of a screw or you may drive the screw out the top of the foot rest. The longer screw will insert into solid wood and hold the foot rest more securely. Secure the foot rest bracket with the new screws and ensure they are snug. Turn the chair upright.