Changed phpmyadmin and Site is gone (Error establishing database connection)

Hi, I am completely new to website building and not familiar with code.

I had trouble getting my pages (other than the homepage) to display, kept getting a 404 error.

I asked for help from a (slightly more experienced) friend, and he managed to get my pages up by changing my permalink settings back to default (I was using a “custom” structure). Then he said to refresh the mySQL database, so we went into wp_options on phpmyadmin (via godaddy.com).

I deleted my siteURL under the “BROWSE” tab of wp_options, but this took the site down. I reversed the deletion (typing my siteURL back in as before) but the site didn’t come back up. Now, I get an “Error establishing database connection” message. I checked the screenshots I took before deleting this one thing, and couldn’t see what else had changed.

Why isn’t my site up again? How do I fix it?

I have searched the forum and tried some fixes, including “disabling plugins then changing permalink structure settings via phpmyadmin” but nothing works. I did not back my database up 🙁