Please see below for details on updating the email address associated with your community account.
Unfortunately users are not able to update their usernames. Please email the Community Team if you need to request an update to your username.
Updating your community email address
From any page in the community, click your profile image at the top right of the page.
This will offer you a drop-down menu -- click My Settings (fig. 1).
Once on the Settings page, click the Email tab to update your email (fig 2).