You can challenge computers by either going to the "new game" tab and clicking one of the light green dots OR going to the "games" tab then subtab "seeks" and click on the computer that you want to play.
Hopefully that helps, but if you need a bit more detail, please let me know :)
So, I've seen accounts with the names "Computer1 - EASY" or "Computer4 - IMPOSSIBLE" and so on.
I'm wondering how i would go about challenging such a computer in live chess. I cant seem to figure out how to do this.
Thanks in advance.