MySQL & PHP: Username logged on insert information on same row in database.?

Okay lets say that I'm logged on because I have a login script working in php and mysql. I want to grab the username that is logged in and update/insert information into a field that doesn't have anything in it yet. Any help would be greatly appreciated.
 
So what part is it that you are unsure about? The HTML form? How you must have it POST the method (via action) to a php script? The php script itself will insert the data into the database with a query and an insert. As long as your HTML form is outputing the name of each field so you can grab it with the PHP script to send it.
 
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