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Peilsender - MediaWiki
MediaWiki:Sidebar defines the navigation bar, which provides links to the most important locations in the wiki and supplies site administrators with a place to add a persistent collection of links. For instance, most wikis will link to their community discussion page and some useful tools.
The default Monobook skin places the navigation bar on the top-left (top-right for right-to-left languages) along with the search bar and toolbox, but the placement may be different in other skins.
Customize the sidebar
As an administrator, edit the wiki page "MediaWiki:Sidebar". (The editinterface permission needs to be enabled and is enabled for administrators by default; for information on assigning it to other groups, see Manual:User rights.) You may need to use the syntax //yourdomain/yourwiki/index.php?title=MediaWiki:Sidebar&action=edit if you use long URLs.
If you are sure you are logged in with the relevant rights but do not see the edit link, click on the create tab at the top of the page - this will take you to the edit page.
Example sidebar code: