Take off the back cover of your phone (you know the back cover), and then look at the sticker carefully. You will find a circle and two ellipses, and then remove those two. , align the middle circle with the camera, and the two elliptical ones with the speaker, and then stick them on

As for the bracket, pinch the upper and lower ends with the front side with one hand, and hold the back side with one hand. The same, and then move it out intuitively. Finally, the sides of the bracket will form an Support