In 2020, in a browser where I'm not logged in to Stack Exchange, I go to my Meta user profile page. That page offers a Profile link at the top left and a Network Profile link at the top right. Below the Network Profile link, it offers a link to my old blog. I want to change it to link to my new blog across all Stack Exchange sites. How can I do that?
In a browser where I am logged in to Meta, on the Home page I click on my picture on the top bar. That opens my Activity page. This, too, has Profile and Network Profile links at top left and right corners, respectively. Clicking the Profile link takes me to a page that says, "Your about me is currently blank."
That suggests that the link to my old blog must be set by the Network Profile link. Clicking on that takes me to a page that lists my old blog's URL, but provides no apparent way to change it. There is an Update Profile Info link at the right, but clicking on that oddly opens a dialog offering to "Choose a site to copy profile information from."
Mike Lischke asked this question in 2013. The answer to his question was to use the Profile (not Network Profile) link > click the Edit link. The appearance (and, apparently, the functionality) of the page has changed since then. The Edit link has apparently been replaced by a "Click here to edit" link. The resulting Edit Your Profile page does not appear to offer a way to replace the displayed link to my old blog.
A response to Lischke says, "The Network profile is just a "portal" to all your accounts around the network, it's not really a standalone profile that you can edit. It's being synchronized with your oldest account." An answer to another question seems to say that I can overrule that default behavior when I edit the profile on any one site: I should see an option to "Save And Copy Profile To All Stack Exchange Accounts."