Cannot access website

Could a volunteer administrator please see if the domain for my club was set up correctly? (My club is 898793, at centurycenter.toastmastersclubs.org .)
If it is not, I will try to follow the instructions "Configuring DNS settings for a Custom Domain Name".
Support:
When I tried to access my club, I got the error message "This website may be impersonating www.centurycenter.toastmastersclubs.org " to steal your personal or financial information." (I use a Safari browser and have an Apple Mac computer.) Then my computer really slowed down (even though I cleared the browser history, turned the computer's power off and on, and restarted my computer.) To (hopefully) fix my computer, my husband had to use a "Time Machine" on a folder in my computer that holds cookies, to go back to May 1, 2019, just to clear out the bad cookie on my computer.

toastmastersclubs.org is the 'free' freetoasthost domain name. You don't need a custom domain name, and from what I can deduce you don't have a custom domain name, so there is no need configure your DNS settings.

centurycenter.toastmastersclubs.org/ works perfectly.
Don't type in the www when searching for your site - just type or copy/paste centurycenter.toastmastersclubs.org