To Log into your account you have to click the "Log In" button on the top right corner of the screen. Once clicked, you will be tacken to a page where you can enter your email address and password associated with your account. Use the email that you specified when you registered, and the latest password that you provided to us.
If you forget your password, you can set a new password by clicking on the link "Forgot your password?" on the login page. Once you click, you will be taken to the "Forgotten password page".
Here you will need to provide the email address associated with your account and click the "Reset" button. This will send an e-mail with a reset link to your email address.
Open the e-mail with the reset link and click on the link. You will be taken to a page where you can set your new password. Once finished, you will be able to log into your account from the Login page, using your new password.