I'm searching by changing the settings in live chess :)
Changing the rating options of who you play?

In the time-control drop down menu in live chess select Custom then click on Rating Options which is just above the Start Game button.

Thanks for your help guys, but its not working for me... Do you think its because I don't have membership?

how to set YOUR rating in games?
You can't set your rating; you get your rating by playing rated games.
You can set a rating range if your opponents for random challenges
https://support.chess.com/en/articles/8598433-how-do-i-choose-what-rating-my-opponents-are
Hi everyone! Recently I have been struggling to change the rating settings of who I want to play. I liked the idea of playing people only better than me and wanted to change it, but when I start a new game, it always searches for someone -200 +200 my rating. Any help would be much appriciated!