How to connect the paper jam when mounting?

First of all, you use a piece of white paper (bigger than that paper), spread the picture on the white paper in reverse, apply glue or white latex on the back of the picture properly, and then cover the picture with a piece of cardboard (as big as that paper) and overlap it with the white paper. After an hour, gently and slowly open the cardboard and white paper, and it will be fine.

Actually, I'm a teacher!