To change your username and password, simply login to your account and click on the My Account page on the left sidebar. There you will see an option to edit your username. Change it accordingly and click the save button.
To change your password, use the section just below username settings. Simply enter your current password, type your new password twice, and click the ‘save’ button.
If you forgot your password, please use the ‘Forgot my password’ button and the password reset option will be sent to your email account.