Click out, start a new hub. Put in your title, allow the permalink to self generate. As long as your title is not already used, it will do it by itself.
If your title is taken you will need to add a word or somehow tweak your title a little. You can do it by adding either your name (by sparklea) or a number (#1 or First in series), or Chapter One, or the words My Experience with...or "My Review" something to make it unique so that the link generates and you don't get the message it is already taken.