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To join a group, the group owner should logon to www.drivehq.com, click on My Account, and then click on Group Account. This goes to the Group Admin main page. There should be a link: "Add existing user". Click it, and enter your username, then click submit. A "Group Invitation" email will be sent to you. Click the link in the email to confirm that you are ok to join the group.
Now if a group account is a premium account, all group members are treated as premium account, even if their account info might still display as Free or True account. Please feel free to let us know if you have any more info.