Just leave the page or start a new game.
Cannot Find a Button to Resign
Martin,
OK Thanks. I did not want to do that without knowing it's ok - I did not want to break a rule of etiquette.

It's the computer. It doesn't care
Chess.com's fair play system does though. If you abandon too many games against the computer you still get penalized.

I would love to be able to resign against the computer, so that I can see the analysis afterward. If I just start a new game, I can't do this (I don't think).

Sorry for the imprecision, but I'm talking about the app, not in-browser. I just realized the analysis options are different. With the app I can't seem to be able to analyze before the game is over, unlike in-browser.

It's the computer. It doesn't care
Chess.com's fair play system does though. If you abandon too many games against the computer you still get penalized.
No yo don't. If you play with the practising computer...

Sorry for the imprecision, but I'm talking about the app, not in-browser. I just realized the analysis options are different. With the app I can't seem to be able to analyze before the game is over, unlike in-browser.
You can grab the PGN at any time and can turn on the analysis option during a game (the computer icon). Not exactly the same but there are some options.
I cannot find a way to resign. I'm playing against the computer. Flipping it menu at top or at left makes no difference.