First of all, you do not have to register more than once.
If you already registered an account, you can tap on "I am already a member" and log in with your email address and your password.
If you can't log in, please make sure your email adress is spelled correctly. If the email address is correct, you could have entered a wrong password.
To reset your password, you can visit www.neuronation.com from a PC or a Laptop.
Click on "Login" in the upper right hand corner of the page. In the small window that now will pop up, hit "change password" in the bottom left corner of the small window.
You will get a confirmation email (if you did not receive it, please check your spam folder). Click on the conformation link inside this email. You will be redirected to the NeuroNation website, where you can enter your new password and log in afterwards.