I'm starting placement matches and I played one till now, I lost it, what do they look at when deciding the rank, the unrated games or the kda, can someone help me?

Agent Dawn Controller Lunar light (2) R150- throw a ball of light that can bounce once before exploding into a violent flash. The flash will explode at the apex of it's second jump and would have a similar moment system of a sage slow orb...

So, I am a Reyna main with Omen as alternative agent in gold. Now I decided, that i want to add Jett to my agentpool. I have played her in a few unrated games and I noticed that i can only use her dash. I have no clue how to use her updraft...