The best way I have found to search the forum for info is by typing my search words into google followed by...
"site: forums.pondboss.com"
It would look like this for wintertime aeration (without the quotation marks)...
"winter aeration site: forums.pondboss.com"
This yields all the threads in PondBoss with the words winter and/or aeration in them. Enjoy the reading, there's a lot there.
This works for all websites too. Just replace the "forums.pondboss.com" with the website you wish to search in.
You've found out the trick!
