Restore WordPress Address (URL) Site is Down

Hello Friends,

On the following site https://www.gibsoncentre.com/

The WordPress site was not appearing on the URL, https://www.gibsoncentre.com/

One had to select the Home navigation button to get the site to show up as it should.
Thinking that if I simply changed the ‘WordPress Address (URL)’ and the ‘Site Address (URL)’ fields from https://www.gibsoncentre.com/ to https://www.gibsoncentre.com/Home -the site would load fine.

I logged in, and on the >General >>Settings page and at the top you have ‘WordPress Address (URL)’ which in this case was populated with: https://www.gibsoncentre.com

– Below this is another field called: ‘Site Address (URL)’ It was also populated with the same: https://www.gibsoncentre.com

I changed both of these fields to: https://www.gibsoncentre.com/Home

Again my reasoning was that since the main site was only appearing on the URL: https://www.gibsoncentre.com/Home why not enter this and try it as a remedy to have the site load on its intended URL of https://www.gibsoncentre.com/

As soon as I save the Changes I started to get errors. See below.

Also the site is a mess.
The Host server would not offer any support because I “touched something” as they put it.
I do have access to the Hosting GUI panel which not a Cpanel per say. but I can access databases MySQL etc. etc.

If anyone has any idea what I can do to fix this issue I would be extremely grate full and appreciative to hear from you.

Thank you so very much in advance.