To edit your user profile,

  1. Click on the 'Profile' link located below the breadcrumbs at the top of the page.

  2. Click on the 'Edit Tab'. Enter details about yourself in the form that is displayed.

Note - Confluence administrators can configure Confluence so that it masks email addresses (e.g. 'exampleUser at atlassian dot com'), protecting it from search engine spiders and the like.