PHP Code:
<if condition="is_member_of($vbulletin->userinfo, usergroup id number here)">This will only be visible to people in the usergroup which you specified
</if>
So for example if I want groups 5, 6 and 7 to be able to see something, I would go:
PHP Code:
<if condition="is_member_of($vbulletin->userinfo, 5,6,7)">This will only be visible to people in usergroups 5,6 and 7
</if>
stick that where you want to in the postbit