HI there. Sorry I missed your post. :(
Are you using the mobile interface? If so, I think in order to join the DDC you will need to scroll all the way to the bottom and use the desktop tab. Once you switch to the desktop version the join button will be at the top.
I couldn't find a way to join a group from the mobile version.
Adina mama to B 4/06 and E 8/13/12 (on her due date!)
|Mothering Help , Embrace A Pregnancy Journal , Due Date Clubs , Sacred Pregnancy A Loving Guide And Journal For Expectant Moms|