Top Navigation: You can customize top navigation bar by add/modify/delete links and reorder links.
Top navigation options can be defined by accessing Top link bar under Site Settings.
At upper right of the site, click on Site Actions menu, click Site Settings
On the Site Settings page, click Top link bar under Look and Feel section.
The Top link bar page appears
You have the following options on Top link bar page.
New Link: This option enables to add new link on top navigation. You have to specify the link name and URL.
Change Order Link: This option enables to reorder the links on top navigation.
Edit/Delete Link: You can edit/delete the links that you no longer require.
Edit Link page displays
To modify the link, update URL/description and click OK
To delete the link, click Delete