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Not sure why that's set to private and don't see an option to make it public.

Here's the address: delete-username-dashes-only-i-n-t-e-r-n-a-u-t@internet-mail.org

I think that you have to write it in the about field in your profile page

Of course! Seem to be a bit dim today. I'll blame it on the weather. It is raining and the sky doesn't have a colour.