Not a problem. Finding your previous thread in the forum can be a bit confusing since most people probably expect to see their thread still on the front page when they come back. But when the forums are busy, threads will be pushed off the front page in a few hours.
If you don't see the thread you started on the front page, the easiest way to find it again is to click on your username which appears at the top of the forum pages, "Welcome, yourusernamehere!" That's a link that brings you to a list of all the threads you've posted in. As I mentioned above, this link also appears under your username in the threads as "Member". You can also click on that link under other people's username to see what threads they've posted in.
We all started out as new, and given the rate of redesign lately we're all new again at some point. :) HTH