How to Make Ranked team 5v5 on new client ...?

Pls help me .... i wanna make ranked team 5v5 but i cant or i dont know how :/ this new client confusing me

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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