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You lost to a cheater- Refund: 6 Rapid Rating Points

I just received this notification a while ago. Quick question: How can I find this certain game that my opponent cheats? I wanna review that game!. Thanks

Go back to recent games within 1-2 days. One of your opponent will be highlighted as cheater( use engine) in their profile.

You will have to go back to almost two weeks.
Go to the games with the time control where you played against a cheater. Press CTRL+F and type −6, perhaps you will find such game where you lost points and the winner was a cheater.

You aren't supposed to do that as it's pointless.

Reconnecting