1. First, lay the colored paper flat on the desktop, and make sure that the back of the colored paper is facing up. Place the bracket in the center of the back of the colored paper.

2. Secondly, spread the two legs of the bracket outward until they are aligned with the edge of the colored paper.

3. Then, gently press the bracket to make it closely fit the colored paper.

4. Finally, check whether the bracket is firmly fixed on the back of the colored paper, and adjust the position of the bracket if necessary.