Website Doesn't Work Anymore

You’ll have to access your WordPress database via phpMyAdmin (most hosting providers offer this in their control panel) and manually change the siteurl and home values back.

When you’re done, follow this guide to move WordPress.

Thanks James. Unfortunately the non-profit organizations has no contact with the person that helped them start up the website. Is there any other way I can manually change it or do I have to create the entire website?

If you can’t manually access the database, you could try some of the other methods:

https://codex.www.ads-software.com/Changing_The_Site_URL