You can do it like this,
 
Admin/Builders/Navigation Menu Builder
 
Add a NEW_ITEM and drop it bellow My Account and write as bellow
 
System Name: Gold Member
Language Key: _Gold Member
Default Name: Gold Member
URL: goldmember.php
Target Window: Same
Visible for: Member
 
Save Changes
-----------------
Add new languages Key,
_Gold_Member_H = Gold Member
_Gold_Member_H1 = Gold Member
-----------------
 
Made a new file and name it goldmember.php copy code bellow, and past it to goldmember,php and then save file.
 
<?
require_once( 'inc/header.inc.php' );
require_once( BX_DIRECTORY_PATH_INC . 'design.inc.php' );
require_once( BX_DIRECTORY_PATH_INC . 'profiles.inc.php' );
require_once( BX_DIRECTORY_PATH_INC . 'utils.inc.php' );
// --------------- page variables and login
$_page['name_index'] = 85;
$_page['css_name'] = 'profiles.css';
$logged['member'] = member_auth(0);
$_page['header'] = _t( "_Gold_Member_H" );
$_page['header_text'] = _t( "_Gold_Member_H1" );
// --------------- page components
$_ni = $_page['name_index'];
$_page_cont[$_ni]['page_main_code'] = PageCompPageMainCode();
// --------------- [END] page components
PageCode();
// --------------- page components functions
/**
 * page code function
 */
function PageCompPageMainCode()
{
 global $site;
        $memberID = (int)$_COOKIE['memberID'];
        $memship_sql = "SELECT `IDLevel` FROM `ProfileMemLevels` WHERE `IDMember` = '$memberID'";
 $memship_arr = db_arr( $memship_sql );
        // Gold member
        if( $memship_arr['IDLevel'] == '4' )
 {
  $ret .= '<div class="profile_ditails_block">';
  $ret .= '<table width="100%" cellpadding=1 cellspacing=1 border=0>';
                $ret .= '<tr><td>';
                $ret .= '<b>GOLD MEMBER INFO/CODE HERE!!!</b>';
                $ret .= '</td></tr>';
                $ret .= '</table>';
  $ret .= '</div>';
  $ret .= '<div class="clear_both"></div>';
 }
        else
 {
                // Standard and Promotion-member - Non-member have no access to this url
                 $ret .= '<div class="profile_ditails_block"></div>';
                 $ret .= '<center><b><a href="membership.php">Click here</a> to upgrade and be a Gold Member now.</b></center><br />';
                 $ret .= '<div class="clear_both"></div>';
 }
 return $ret;
}
?>
==================
DONE!
 
check also inside table MemLevels wich ID your membership Name have,
edit number 4 in code bellow if you have another number on your membership.
if( $memship_arr['IDLevel'] == '4' )
----------
 
Add your own goldmember.css file, I have used profiles.css here now.
----------
 
If a member click on the link on account page
Gold Member will see your content, everyone else wil have a page with a upgrade link.
 
Cheers