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Go to id.atlassian.com and into the "profile" settings (top right, your user icon), you can change your display-name there.
I'd strongly recommend using a more human name when you do this. Using an organisation name (like Roblox) exposes you to accusations of misrepresentation, and generic impersonal names (like infoblock, jira admin, or test) are a red-flag to spam-detection algorithms. I had to hoof this post out of the spam queue to answer it. Try a pseudonym or nickname if you don't want to use your real name.
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