Your name, title, and avatar live in Profile Settings, reachable from the User Menu.
Update your profile
- Click your avatar in the prompt bar to open the User Menu.
- Click your profile card to open Profile Settings.
- Edit Name or Title — both save automatically about a second after you stop typing. A Saving… tag appears, then Saved.
- To change your avatar, click the photo (or its Edit overlay) to open a file picker, then choose an image.
Your email address is shown here too, but it's read-only — use the Change button next to it instead. See Change Your Email Address.