First up – my apologies for the confusion yesterday on the related thread so let’s try and get it right today!
You will need to edit the spTopicView.php template in your SP theme – you can use the theme editor for this.
Because this a new optional feature introduced in V5 you will need to add to the template. Locate the call in that template to the template function: sp_PostIndexUserSpecialRank().
Underneath this – add this line of code:
sp_PostIndexUserMemberships('tagClass=spPostUserMemberships spCenter&showBadge=1&showTitle=0');
This will show badged linked to the members User Group and will inhibit the display of the User group name.
As always we recommend that you create your own SP theme so that any customisation is not lost during a future update. (http://codex.simple-press.com/codex/themes/theme-basics/creating-a-theme/)
Hopefully I got it right this morning!