Set up board for game started elsewhere?

I was mid-way in a game with a friend I was visiting and we'd like to set up the board now to continue. Is there any way to do that?
Thanks,
Adam

Click on new game from the menu at the top. Click on the advanced options link near the bottom of that page and you'll see the set up position option. Click that and play around with the position.

Don't forget to check the other options are all OK for you when you've finished the set-up.