The second thing you ask for, "search in posts for a certain piece of text", is on my computer. It has nothing to do with BrainKing. It's part of the edit function. I'm using AOL and if I click the Edit button a window drops down and shows me at the bottom of a list of options; "Find in top window". If I click that, a little window appears and I can type in the text I'm searching for and then the find next button and search all the way through the top window. I'd be willing to bet that whatever operating system that you are using has this feature.

As for a particular person messages, I don't have that feature. I could use the edit feature I just told you about and put their handle as the text. Then it would find each message by them, plus any time someone else correctly typed that handle in one of their posts.