You might find this video useful:
Please don't worry if you forget your username, you can also use the email address associated with your account to log in.
If you forget your password, you should easily see where you can request to reset your password.
If you are trying to log in from the drop down sign-in box... you should click on the small question mark to the right of the password box.
If you are trying to log-in from the log-in screen.. you should click on "forgot password".
You will then be asked to enter your email address so that the reset password link can be sent to you.
Then please check you emails.... you should allow sufficient time for the email to be received. Should the email not be received please do contact the support team so that they can assist you - please do not request multiple reset links.
In the email you should click the "reset password" link and enter your new password.
You will then be able to log in with your new password.