How to change name?

How do I change the name associated with an account? I can change the displayed name easy enough but the profile URL stays the same. The help files say you can do this by logging into the "articulate online" account and going to the settings tab, but articulate online doesn't even have a place to log in, and the profile page here doesn't have a settings tab. Confused!

Example: If you click on my current display name (Martha Jones) you are taken to a page with a URL that says my original name (Rose Tyler). 

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