report cheater

I met an account named anhthong69, his elo was only elo 200-400 and he won 3 games in a row with me when my elo was 1550. Then I checked how he played and I was surprised that every move he made was very unusual, even the moves took at least 7-9 seconds. Can anyone help me report him? https://www.chess.com/analysis/game/live/142236050935?tab=analysis