Step 1: Prepare tools, scissors, disposable cake tray, colored transparent tape and ruler. Step 2: Subtract a circle from the edge of the plate. Step 3: Mark the back of the plate. Step 4: Cut some seams according to the marks just drawn. Step 5: Fold the box into a solid shape and fix it with a paper clip. Step 6: Finally, put on colored tape, so that a beautiful box is finished.