When I did it, we PM'd names to each other. I then called Disney Dining to change my ADR # to their name. Once done I PM'd the person with the ADR number (reconfirming restaurant, time and party size)
The LeCell that I transferred was taken advantage of by two Dis families!
Please be very careful when doing this. The CM's at Disney Dining are not really happy about this transferring ADR thing. I tried on our recent trip and got a very upset and mean CM. Just a warning. Also, when posting your ADR's for trade, anyone can see them and 2 or more families may show up to use your ADR's. Just be very careful.