From the HOME page, click on the PERSON icon.
From this screen you can:
1) Change your account name and/or company name.
2) Change your phone number.
3) Change your email address.
4) Change your password. In this case you will need to know your current password. If you have forgotten it, see Reset My Password.
5) When you have completed updating your information, click on UPDATE DETAILS at the bottom of the page.