How do you lease for forging using the new MoFo wallet?

Also, for solo forging, if I close the forging window by clicking on the "cancel" button, will I still be forging at that point? Or do I have to leave the forging window open all the time? If so, that would mean I can't do anything else with my wallet during forging.

Edit: I got my questions answered by poking around the Fimk forum. You have to use the original (though with mandatory upgrade) browser version to be able to lease your balance for forging. The MoFo wallet is nice for the ability to quickly check balances and send funds (without having to download the block chain or run the java program), but I wouldn't trust it with forging at this point--I'm not entirely sure the forging is functional in MoFo. I also agree with some of the others on the forum, that for English speakers the choice of name is unfortunate.