Go to the LTSE Account reset page, enter the email address associated with your account and click the "Send password reset instructions" button.
A green banner will appear at the top of the page confirming that the email with instructions was sent and will arrive in a few minutes.
Go to your email inbox and there will be a email from LTSE with a link to click in order to reset your password
Type in your new password then re type the new password in order to confirm the new password change. After this step you will have successfully reset your password.