Use the Advanced Search feature. The button is in the upper right of the page. Here is a link: http://www.beesource.com/forums/search.php
Don't forget to look at/set the options at the bottom of the search page.
Actually, I suspect you are looking at the default Multi Content search tab. That one doesn't work well for me. Instead, once you have that page open, click the Single Content tab to the left.
Once you get search options figured out, you can click the Save Search Preferences at the bottom to make those settings the default for you.
Note that this search function will not search for 3 letter (or less) words. Your only option for that is the Google Custom Search on the homepage: http://www.beesource.com/
But this search has no options for searching by member name.
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