1. First, you need to find the lost parts of the music photo frame and check whether they are damaged or missing. If there are any damages or missing parts, you need to replace the parts.

2. Secondly, determine the installation position. According to the shape and function of the part, determine its installation position and direction, paying attention to the cooperation and coordination with other parts.

3. Finally install the parts. According to the structure and assembly method of the music photo frame, install the parts to the corresponding positions and confirm whether they are firm.