If you don’t remember your username or password, click on the "Forgotten your username or password?"

You‘ll be redirected to a new page. In order to access your account, you need to remember either your username or your email address. Use either option to search and click the ‘search button’.

In your email you should have found a message like this:

Click on the web address and follow the instructions to set a new password.
(If you can’t find this email in your inbox folder, check in the spam folder as well.)