Go to FTP, open /admin/applications/core/extenstions/usercpForms.php,

Find:

	if ( $this->memberData['g_attach_max'] != -1 )
	{
		$array[] = array(
						'url'    => 'area=attachments',
						'title'  => ipsRegistry::instance()->getClass('class_localization')->words['m_attach'],
						'active' => $this->request['tab'] == 'core' && $this->request['area'] == 'attachments' ? 1 : 0,
						'area'   => 'attachments'
						);
	}

Add BELOW:

               if ( IPSLib::appIsInstalled('bottombar') )
               {
                       $array[] = array( 'url'    => 'area=bottombar',
                                                         'area'   => 'bottombar',
                                                         'title'  => 'Bottom Bar Configuration',
                                                         'active' => $this->request['tab'] == 'core' && $this->request['area'] == 'bottombar' ? 1 : 0 );
               }

Find:

		case 'notes':
			return $this->showFormNotes();
		break;

Add BELOW:

		case 'bottombar':
			return $this->showFormBottomBar();
		break;

Find:

		case 'notes':
			return $this->saveFormNotes();
		break;

Add BELOW:

		case 'bottombar':
			return $this->saveFormBottomBar();
		break;

Find:

/**
 * UserCP Save Form: Password
 *
 * @access	public
 * @param	array	Array of member / core_sys_login information (if we're editing)
 * @return	mixed	Array of errors / boolean true
 */
public function saveFormPassword( $member=array() )
{

Add ABOVE:

/**
 * UserCP Save Form: Bottom Bar
 *
 * @access	public
 * @author	Brandon Farber
 * @return	boolean		Successful
 */
       public function saveFormBottomBar( $current_area )
       {
               $_hide        = $this->request['hide_bottombar'] ? 1 : 0;

               IPSMember::packMemberCache( $this->memberData['member_id'], array( 'hide_bottombar' => $_hide ), $this->memberData['_cache'] );
       }

Find:

/**
 * UserCP Form Check
 *
 * @access	public
 * @author	Matt Mecham
 * @param	string		Current area as defined by 'get_links'
 * @return	string		Processed HTML
 */
public function saveForm( $current_area )
{

Add ABOVE:

/**
 * Show the Bottom Bar form
 *
 * @access	public
 * @author	Brandon Farber
 * @return	string		Processed HTML
 */
       public function showFormBottomBar()
       {
               return $this->registry->output->getTemplate('bottombar')->usercpSettings();
       }

Good Luck!

Donald :)

Source: Download: Bottom Bar (Beta 2)