At the top of the page in the dark blue board, you will find the word Search with a down arrow beside it. Click on it. A small window will pop up. Type in your keyword(s) and click on go. A page should show up with a list of thread that speak to the subject you are interested in. If the threads aren't ones you want, then refine your keywords until you get what you want.
Also, at the bottom of this page, you will see a list of threads that are similar to the one you have started. Happy hunting!