I don't know how to do it on the phone, TR. I didn't even try on my phone... it is too small and too confusing for me from there. But you could try.
It is loading on my laptop again now, so I've opened the room back up. If you go to the drop down menu on the 'chat' tab click on the room 'DD'. If you don't see that one click on lobby and then go to the DD room from there. Message me if you need the password.