This question is in reference to Atlassian Documentation: Setting up your workspace
On Server - change your DNS/routing to land on the new url, then go to admin -> general configuration and change the base url.
On Cloud - you can't change it directly, you have to do a "move" rather than "change": You can buy a new Cloud system, export from the old one, and import it all on to the new one, and then shut down (or not pay for) the old Cloud system.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.