How to put up a sign when the door is broken?

1. Prepare a piece of cardboard and draw the shape and size of the required signboard on it with a pencil.

2. Determine the appropriate size according to the size of the door. Cut the cardboard into corresponding shapes along the drawn lines with scissors. Make sure the edges are neat and smooth.

3. Apply glue to the back of the signboard, and make sure that the signboard is flat and firmly attached to the surface of the door when pasting the position on the door.