Hi,
Those top links can be removed from the layout.master file of the skin.
There is a Web.config/user.config setting to control who can see the member list:
<add key="RolesThatCanViewMemberList" value="Authenticated Users" />
you could change it to
<add key="RolesThatCanViewMemberList" value="Admins; Role Admins" />
if you only want those roles to view it.
Hope it helps,
Joe