In your box, you need included instructions. I spent an 1 hours watching other influencers unboxing. I still put arm together wrong. The person, who cleans my fish tank, corrected my error.
Thanks for your suggestion, here is the operation video of the mounting bracket, the installation steps are the same for K7 PRO III and K7 V3. Go to https://www.youtube.com/watch?v=1Ia-1eFJKqI