This is simple and easy!
1. Login as usual, and at the top of the your workbench, click on recent pages.
2. If you don't see your page listed, search for the page you are wanting to edit or change the URL for.
3. Once you find the page, click on the page you want to edit and click on Edit Page Settings.
4. In the URL field... put in your new URL field and click apply to save the changes.
See? That did not take long at all! You now have extra time, so walk around the office and find the first person you see and say, "I totes owned that URL change".