Editing My Business Website

I have been a Comcast Business customer for MANY years, and I used to be able to login to my account and use a Website Builder to edit my website. My login email is [Edited: "Personal Information"]. My website is libertyglassco.net. The new Comcast Business website does not recognize my domain, and I don't see any way to edit my website. The website is still up and active, but I need to make some changes to it, and I do not see a way to do so.

I see a tile on my webpage that says "Register your Domain," but I already have a domain name. And when I type libertyglassco.net in, it shows it as unavailable (because I have it), but it's almost like my account is not recognizing that I already have a domain set up from 8 or 9 years ago when I switched to Comcast.