NOTE: if you forgot your password and need to reset it, check out this article.
Once you have logged into your account you are welcome to change your password at anytime. To do so just click on your user name at the top of the screen.
This will take you to the screen that allows you to choose a different password. Simply type in your new password and confirm the changes.
If the rest of your contact details are correct and up to date, click on 'Save my details'.