The way I think you have it set up is that you have a list of usernames.
When you click on the username you're passing the userid through the url, correct?.
If so make a query on the user's table where userid = $_GET[userid] (I don't know the secure one off hand) above the form_start where radio button is.
Assuming you're using $row['status']
Here's an example radio button
PHP Code:
print_yes_no_row($vbphrase['phrase'], 'some_name', $row['status']);
If $row['status'] equals "1" then "Yes" will be checked.
If it equals "0" then "No" will be checked.