Adding friends in mousetopia is easy, in the main Lounge, just click on a username and then click Add Friend.
Monorail note: starting august 1st, monorail service will be cut back. The hotel loop monorail will now close 1 hour after REGULAR park closing, so if you are staying for extra magic hours and you are at the contemporary, polonisian, or grand Floridian, you will have to take the boat, bus or walk. This cut back in hours has already started on the epcot loop. In addition the tron monorail has been sent to the maintenance shed to be put back to the coral monorail, so they are down to 10 monorails.