Hello.
You will need to customize proper web part:
/CMSWebParts/Community/Shortcuts.ascx(.cs).Here, "Create a Group" link button is defined like:
<cms:LocalizedHyperlink ID="lnkCreateNewGroup" runat="server" ResourceString="group.creategroup" />So, you can set
lnkCreateNewGroup.Visible property to true/false according to current user´s role (in
SetupControl method).
You can see how to check current´s user role
here.Best Regards,
Radek Macalik