Clicking My profile on your My start page displays the Edit user screen where you can view and edit your user account settings. Information on this screen includes your current account settings (username, registered email address, full name and organization) as well as what groups you belong to and what roles you have in the domain and particular projects. You can edit your registered email address and full name and, in some cases, your organization. Fields that require an entry are indicated by an astrisks (*). You can also use this screen to change your password. Password restrictions are listed below the password entry and verification fields. To change your password you must enter your current password.
The Edit user screen lists the roles you have in any project you have joined on the site. Each project name is linked to it's home page where you can change your role by clicking on Request project membeship/role. Read more about project roles.
When you delete a user from a domain, you will be asked to confirm your decision. Once you delete a user, you cannot reinstate the user account into the domain. And the same username cannot be used for any other user account you may create in the future.