Every user has his own wiki where he stores his private Wiki pages or works on drafts before being published on the public Wiki. From the drop-down menu of your display name, select My Wiki to be redirected to your own Wiki page. See the Working With Wikis chapter for the full details.
Note
Your wiki page is private by default. This means only you and your administrator can access this via the link (.../wiki/user/[username]).
However, if you have made public for your own wiki, anyone can access, read and edit it via the link.