Clear off the desk surface and remove any drawers.
Turn the desk upside down with the help of a friend and set it on a level surface to inspect the construction. Locate the screws or bolts on the inner side of each leg where it attaches to the underside of the desk
Tighten all screws or bolts with a screwdriver or wrench. Turn over the desk with a friend's help and test the desk for stability. If it is still shaky, continue with the next phase of the repair.
Flip over the desk once more to place it on a level surface.
Apply a thin bead of wood glue to all desk joints. This includes the two joints where each leg attaches to the underside of the desk.
Attach a C-clamp to each leg and the edge of the desk to apply pressure while the glue dries, typically within 24 hours.
Wipe away any excess glue before it hardens, using damp paper towels.
Glue and clamp the front plate on loose desk drawers in the same manner as repairing desk leg joints to restore rigidity to the drawer's box-like shape. Do not place the drawers in the desk until the glue hardens.