[Lynne]

You would need to put a condition around the link. If it's in a template, then put this around it (change X, Y, Z to the usergroups you want to hide it from):

<if condition="!is_member_of($bbuserinfo, X, Y, Z)">
link to show if you aren't a member of usergroups X, Y, Z
</if>

If it's plugin code, you'll have to use php:

PHP Code:

if (is_member_of($vbulletin->userinfo, X, Y, Z))   {
link to show if you aren't a member of usergroups X, Y, Z
} 


If you don't know where the code it, the place to ask for help is in the modification thread since they are the ones who would know.