You have to create a custom challenge. If you are on v2 you will want the advanced options.
How to play unrated?
All I can see is this. How ro get advanced options? The whole chess.com site is a bit messy, I think.

The policeguitar stated:
> The whole chess.com site is a bit messy, I think.
The old GUI was much better. The new GUI is for the new generation that does not mind guessing what to click (-;
It used to be possible to play unrated at all time limits. I see no way to do that now (does not mean it might not be buried in one of the icons - to see what icon does, you must laboriously drag mouse over it and hope it pops up a baloon telling you what it doe)
Cheers,
Dennis
I simply cannot see a button to toggle my games to be unrated. Where is such a button?