There are a couple of ways to find the replies to your thread.
You can brows the original forum you posted in (in this case "New Member Introductions"), you'll find that threads you haven't looked at that contain new posts will be highlighted in bold, simply click on this and scroll down to see the new posts.
You can also set parameters in your profile so that you receive an email notification of any new replies to your thread, this email should contain a link to the thread taking you directly to it as well as informing you of the text contained in the new post.
If you click on this link below it contains info on posting and replying, finding your forum, basically all sorts of useful information for new members, this is also one of the first threads in the "New Member Introductions" page.
A forum community dedicated to BMW owners and enthusiasts. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Bringing the BMW community together.