There are a couple of ways to find your recent posts. The first is to look in your usercp (profile)
and click on the stats tab. There is a link to view all your posts.
If you made the post in the last day or so, you can click on the quick links drop down menu and select todays posts for a full list of all updated threads.
You could also subscribe to the thread you have posted to for e-mail updates. Use the thread tools drop down menu at the top of the thread to do this or change all your subscriptions preferences in your profile so that you are automatically subscribed when you respond to a thread.
So many choices....