How do I report toxic behavior outside of the exit screen for League of Legends?

How do I report toxic behavior outside of the exit screen for League of Legends? There is this guy named *IM NOT GOING TO SAY THEIR NAME* who is very mean to me and I want to report his toxic behavior, how do I do that?
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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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