You can create a Live Analysis board from the game in your archive, then invite your opponent to it. The icon that looks like a clock will create that.
It may be possible to do it directly from the post game dialog or directly from the game screen after the dialog is cancelled. I would have to play a game to test it 
I'm not new to the site, but I don't know how to use all the features. I just played a game with someone online and I want to go over the game with them and make comments in live time?
How do I invite someone into a game I played to go over it with them on chess.com.