Great post on how to do this is here:
Except for the fact that it puts an emoticon in the tags. Here it is without those:
<asp:Content contentplaceholderid=”PlaceHolderMain” runat=”server”>
add this line
<Sharepoint:SPSecurityTrimmedControl runat=”server” PermissionsString=”ManagePermissions”>
then directly before that sections closing tag (it happens to be the last line in the file) which looks like this
add in the closing tag for the SPSecurityTrimmedControl i.e.