Judy,
Shal, I wasn't aware, until you wrote this message, that there was a
beta group. Do you happen to have a link to this group?
The URL format looks a bit different than GMF's because beta@ has subgroups. However, the "normal" URL format also works:
/g/betaFor what it is worth, you can generally construct the URL for any group name by substituting the group name in the above URL.
Shal