Are you sure you are using the correct username?
To make sure this is not what is stopping you from logging in, it could be a good idea to start with resetting your user name as well.
To do this, you need to click on the Forgot something link on the login page.
On the next page, click on the link in the second paragraph Forgot Login on the link where it says click here.
Enter your email address, check the box to confirm you are not a robot and an email to reset your login will be sent to you.
After resetting your login name, you will have to redo the process of creating a new password again.