This tutorial covers the Edit Category fields after clicking on the the admin's right nav links.
1. First page - You will see a list of your categories. Click on the "Change" link to the right of the categories name, and you will be taken to a new page.
2. Next Page - You will see the categories name in a text field. Change the name as you wish
Once you've finished, click the "Submit" button to save any changes to the categories name!