just add to blocks/. open blocks/usercp.php and add below where you want to show or theme/THEME_NAME/main.php
Code:
if ($user->admin) {
include("blocks/staffnav_block.php");
}
might want to change some links for your own, this is just how mine is.
p.s i make all my blocks in own php file and simply add above where i want to show. less text in usercp's.php or themes main.php then ;)