There are many reasons why it's not possible to register or login. An inter space before or behind your e-mail address causes the error message saying that you have to enter a valid e-mail address. It is also possible that there is an inter space behind your password. Please beware that passwords are case sensitive. If you're still not able to register/log in, please don't hesitate to contact our customer service at firstname.lastname@example.org. We will be happy to help.