You need to have cookies enabled here to log in .

 Logging in and being registered at the old site does not automatically carry over here.

 However if you registered here  before you should be able to log in again if your cookies are enabled. I would say since it knows your user name and email address are already in use you were successful in registering previously.

 As far as viewing all the replies once you get logged in go to your control panel and down to the part where it says "default thread viewing method" and select the "nested" option. That way wherever you click on a response in a thread you will go to that response but all the others will load also. It is merely a matter of scrolling up or down the page to see them all. That can take a little extra time if you are on a slow dial up connection and there happens to be pictures within the thread but it saves lot of time by not needing to click on each individual post.

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