Extend privacy setting in BlogsMU theme to include 'groups' in addition to 'members&#

Hi, I would like to extend the privacy setting, currenlty covers only the members directory of BP in BlogsMU theme, to include ‘Groups’. I can make the ‘Group’ NAV switch off but the groups directory page URL) is still accessible by logged-out users. I would like to protect access to ‘Groups’ all together and redirect user that are not logged in to the registration page – just like the ‘members’ section does when activated. Your help is greatly appreciated.

Thank you!