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Screw the two scrap outriggers -- 3/4" x 3/4" pieces of wood, each 4" longer than the board to be planed -- to the sides of the board to be planed. Make sure to countersink the holes so the screws won't get caught inside the planer.
Send the board and its outriggers through the machine as you would a large piece of wood. Remember that the planer automatically sends the wood to its outfeed table, so there's no need to push the wood through.
Use a screwdriver to remove the outriggers.
Use a jointer or hand-held planer to smooth the rough edges where the outriggers were attached.