Fatal Error, Site URL issue

I broke my site!

I have a self-hosted site which is not yet live. I am accessing it through a skipdns.link (its a permanent link), which is https://www.skipdns.link/7lanu

The actual domain I am working with is tangohelena.com

My Jetpack plugin was not able to connect, so I figured it might work better by telling it to use the skipdns.link.

Anyway, in General Settings I changed the Site Address URL and the WordPress Address URL to “https://www.skipdns.link/7lanu”

And that broke my site.
In your support files I did find this article: https://projectdmc.org/support/article/changing-the-site-url/ but the solutions listed there don’t work for me.

I do have access to the site through the Fillezilla FTP client. I’ve tried changing the wp-config.php to add these lines:
define( ‘WP_HOME’, ‘http://example.com’ );
define( ‘WP_SITEURL’, ‘http://example.com’ );
with example.com switched out for tangohelena.com
but no go.
I also tried editing the active theme’s functions.php in a similar way, but no go.
I’ve did successfully turn on the wp_debug mode in the wp-config.php file.

Now if I type in “https://7lanu.skipdns.link/wp”
I get a truncated text-only version of the site with a 404 Not Found error.
At the top it lists the following problems:

Notice: Function add_theme_support( ‘html5’ ) was called incorrectly. You need to pass an array of types. Please see Debugging in WordPress for more information. (This message was added in version 3.6.1.) in /home/tangohel/domains/7lanu.skipdns.link/public_html/wp/wp-includes/functions.php on line 5835

Notice: Undefined index: woo_notice_bg_color in /home/tangohel/domains/7lanu.skipdns.link/public_html/wp/wp-content/plugins/pagelayer/main/woocommerce.php on line 206

Is there another place I can go to change the site URL? Any help would be much appreciated!!

The page I need help with: [log in to see the link]

 

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