How do you get rank upgrades?

??

I assume you mean grade. You increase these by grade boosters

They are PvP rewards. If you PvP enough, you’ll get some. To claim them and/or see when you can get them, you go to the PvP screen and tap on the gift box icon on the left.

oh ok lol i tried but sat there for 20 min waiting for someone gave up lol thanks