There are a few reasons why you are not able to login after registering. Please check the following:
1) Make sure you used a valid email address so you can get the confermation email.
2) Make sure that the email did not go to your Spam or Trash folder.
3) Make sure you did ONLY one of two things:
a) Clicked on the link provided in the email to verify your account.
b) or Copy the code and paste it in the confirmation window.