Modify permalink step from YouTube tutorial deleted website content

I was creating the following website as part of my final graduate project through the University of Arizona: https://www.wordpress-group-ws822015.azurewebsites.net

To customize the site from the original Sydney theme that I installed, I’ve been following the NYC Tech Club tutorial to update plugins as I have no prior web design background. Here’s the tutorial: https://www.nyctechclub.com/how-to-build-a-wordpress-website-2016-updated/ (There’s also a YouTube video walkthrough of the same tutorial, which was what I was using as well. The steps are the same in both versions.)

I got to the very final step (step 33) of the tutorial, which was supposed to be modifying the permalinks for the homepage and the blog page so that instead of the default wordpress-group-ws822015.azurewebsites.net that I had previously been accessing, it would add the www. in front of it. I followed the directions on the tutorial and tried to restart the WordPress dashboard for the website as was prompted by the tutorial, but now that I did that, I can’t access the website. Every time it tries to pull up either the old or new URL address, all I get is a general Cox error page that says ‘Sorry, the website https://www.wordpress-group-ws822015.azurewebsites.net cannot be found.’ I can’t get into any of the website pages now, let alone the WP administrative view to figure out how to fix this darn thing.

Any help would be greatly appreciated, as I would really like to not have to redesign an entire webpage!!

Thanks so much!!

~A confused and overwhelmed nursing student~