The installation method is relatively easy, just find a small hole in the rear wheel.
Find the screw hole mount + screws + nuts on the back.
Tighten the screws and nuts and tighten the screw hole mounting brackets.
The angle can be adjusted up or down according to your needs.When adjusting the angle, you need to loosen the screws before adjusting.
Please note that some screws and nuts are not especially suitable and should be used with tools such as pliers.