I use Thunderbird. I have version 1.0.7 installed.

When I am searching for an email, I'd like to be able to use the "Find"
feature found in the Edit menu. However, when I select "Find Messages"
a dialog box opens and I cannot find out where to type in my search
criteria. I can checkmark "search subfolders" and I can select "Match
all of the following" or "match any of the following" but there is no
textbox for me to actually define my criteria and add it to the list of

Clearly I am missing something here.

Or is there an Extension I need?

Thanks for any/all feedback-