1) Go to Cloud PBX - Groups
2) Click to edit your group
3) Click Voicemail tab
Option A: Use on of your users' voice mailboxes for the group
Option B: Use the Group's voicemail box by leaving the user empty, and entering an email address to receive the message
Note: If you forget your group voicemail password, go to Cloud PBX - Groups, click on "Passwords" beside that group, and click "Reset Voicemail Password". A new one will be emailed out to you.