Gluing wood to metal isn't a great idea. Use some sheet metal screws. Drill a pilot hole through the piece of wood and through the metal, and use a sheet metal screw that's at least 1/4" - 1/2" longer than the thickness of the piece of wood that you're using. Just make sure that the screw isn't so long that you'll go through the desktop. (Keep in mind that when you drill your pilot holes, you want to use a drill bit with a diameter just slightly smaller than the diameter of the screw)
Also, it's not a bad idea to put some "liquid nails" or another all purpose adhesive on the board before you screw it to the desk, just for added support.
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