Depends what you want, really.
For multiple days per move: you can go to "My Home" on the above bar, select "My Online Chess," and then "Start New Game." From there you can challenge a particular user, and they'll accept whenever they're available.
For faux-OTB (i.e, games played in one sitting of a number of minutes), go to "My Home" again, and then "My Live Chess," and select "Play Now." If you have a particular person in mind, you can challenge them through your friends list, if not, just accept an open challenge.
how do you set up interactive chess board to play somebody overseas at particular date/time? thanks.