Only superusers can edit details about their own profile, including name, username and email information. Ordinary users can only edit the password field, which they should only do if local authentication is being used. (For more detail, see: https://saltycloud.atlassian.net/wiki/spaces/TES/pages/1891041281 ).
From the drop-down menu in the upper right-hand corner, click on Profile.
Any of the fields on the page can be updated. Note that if you disable and then re-enable token API access, you will get a new token.
Click Save when finished.
See also: https://saltycloud.atlassian.net/wiki/spaces/TES/pages/1898151937