Please do not play Xayah and Rakan in your ranked games if you have zero idea what they do.
This goes for any champion, but really. With the release of two new champions, people locking them in ranked and then getting into the game with zero knowledge of how to play them is so infuriating. Honestly, last game I had a Xayah who ult'ed THREE times in the entire game. All three of the ults she used were in 1 v 3 scenarios where she got caught out and used it as the last resort. So please, for the love of God, stop playing champions in ranked if you have no clue how to play them. All you're doing is setting up you and your team for a free loss.