If you both sign into the normal live chess you'll see a friends tab on the bottom left beside the alerts.
Here you can watch the game your friend is playing or challenge them to a game if they are not playing.
how to play with friend?
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I have invited my friend to join here at chess.com and he created account few days ago. Only problem is that I don't know how to challenge him to play live chess (blitz 5/10 min.) with me. I found I can challenge him to play 1 day or more days per turn game but I want some quick matches with him. Any suggestions how to do this?