How it could work:
- User reads a thread and sees the reply box at the bottom.
- The user decides to enter a reply, a username and password and submits
- A notification informs the user that an email confirmation has been sent to his email address and that the post will become visible after registration is complete.
- The user clicks the email confirmation link from a received email and is taken to the website.
- The user fills in all needed profile fields (if any)
- The user is taken back to the post.