Joe, there is no forum there, therefore no threads.
The resource guide is a database of names and addresses.
Click on the "search" link and you'll go to the search page where you can follow the instructions on the thread in this section of the Ask the Experts titled "structural engineer".

It's all there, you just clicked the wrong link...

Jim Rogers

Link to search page: Click HERE for link to search page.....

Whatever you do, have fun doing it!