If you are locked out of your account, you can select Forgot password? when logging in, or reset your password here. Enter the email address that is associated with your account, then select Reset Password. You will receive an email with a temporary password and a link to login.
If you are logged into your account and would like to change your password, you can do this by navigating to Settings in the drop down by your name and select Account.
From Account, enter your current or temporary password, a new password, then click Change Password to save.
Do you need additional information? Submit a support ticket.