Not able to edit our website pages

Club # 2347

Club Web Address: www.bramptontoastmasters.com

-Issue happening for last few months

-Windows 7, Vivaldi browser (latest)

-browser cache refreshed, cookies enabled; issue is happening for other members as well

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I have some screenshots attached.

Also, when clicking certain web pages in our club website, the "Request a website" page comes up. (Does this mean we need to renew something?)

Thanks for any help!

1) what pages are you trying to edit?

2) what pages exactly are giving your the "Request a website"

Brian:
1. Custom domain DNS settings not set up correctly for FTH mail.
2. Several Custom Web Pages have link elements, bootstrap style sheet references, a bootstrap javascript reference, and one has an html base element in it. Warnings were clearly ignored. Pages are accessible until you click one of those custom web pages, then everything goes off the rails.

Thank you, Brian and Steve, for the help -- I know why these errors are coming up now