Hi Jaine,
There is a search function. In fact, there are many.
If you click the link at the top of every page, you will see where you can search many types of materials. (See screenshot below)
Also, if you click 'Advanced Search' or go here
http://www.eslhq.com/forums/search.php you can do highly customized searches.
Let me know if you have any difficulties do these things.
Eric