adding mysql_real_escape_string

When i am preparing my data for insertion into the database i am adding mysql_real_escape_string, but how do i add it to the [b]about_me[/b] part.

[code=php]//retrieve form data in a variable
$firstname = mysql_real_escape_string($_POST[‘firstname’]);
[b]$about_me[/b] = ‘?’;[/code]

there is no text field called, about_me. I am just giving about_me a value of “?” so that it will be inserted into the database (it will be used later on) But just incase someone tries to mess around with my code i want to add mysql_real_escape_string infront of it
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thanks

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