How do i report people?

hi, i was just in a room with a person called hitman something, i got a screenshot but i couldnt save replay because i was just a little bit to slow. it was very very obvious that he was aim botting to everyone that was playing, we tryed kicking him but some people declined. it was one of the most annoying things ever! hes ruining our k/d. anyone can someone tell me were to go to report people.. thanks

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