This question really shouldn't be here. Try "Community Questions and Feedback" next time. Anyways, in answer to your question, there are two ways (that I know of):
1) click your name at the top right corner. scroll down a bit, and click the link that says "View All Threads Started by This Person" or something like that.
2) When you make the thread, subscribe to it and every time you visit your user cp, you'll see which threads have been replied to. To subscribe to a thread, click thread tools (at the top of a thread) and then "Subscribe to This Thread". Hope this helped, and remember: make sure you're posting in the right area, or you'll get a warning from a Moderator
Motsuko