The best way I have found to search the forum for info is by typing my search words into google followed by...
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!