Make sure your password is correct. It is case sensitive.
Make sure your username is correct. It is probably NOT your email address.
If you don't know either your password or username, use the link to request a password reset.
You will receive a link via email that will let you reset your password. You will need to set a new password first thing when you access your account. If you don't do it right away, you will be asked for your old password when you try to change your password later.
The email will also contain your username. You will need this username to log in in the future. You can change your username when you change your password if you like.