At the top of this page you will see User CP. Click that and it will take you to the page where you can edit your and your jeeps profiles, add avatars, signatures, etc.
To keep tabs on a thread you started (or any thread that interests you) at the top of the page again you will see thread tools. That gives you the option of being informed if there are any additions to the thread.
Hope this helps. Any more questions, feel free to ask or if you prefer just click on my avatar and it will take you to my profile where you can pm me.