New member opt-in link does not work

So the change I made as noted in the most recent attachment is now blocking the domain. Not sure what the CNAME line designates, but it may be the reason the domain can't be reached. Should I just delete that line?

You need to contact your registrar help line.

A follow up. I reached a knowledgeable CSR at the registrar and was told that the @ symbol on their service is used to represent the domain name. He made some edits to the record, see attached.
Seems to work ok. Note that on the Firefox browser, entering www.lodotoastmasters.org results in the "potential security risk" yellow screen. I was told this may have something to do with our security settings. The warning does not pop up with the Chrome browser, or I'm told with Safari. Is this anything we can fix? Thanks for your patience.
Dan, club#9839

www.lodotoastmasters.org now works

Yup. Looks like we have this resolved. One of the two officers noted above has confirmed the opt-in link worked OK and the other is probably busy. Unless something unexpected pops up, please consider this issue closed. Thanks for all your help.
Dan #9839