Turning on some thing in PHP.

Does any one know how to turn on a function on in PHP.
I want to turn on "sendmail_from"...

http://www.circlehosting.net/test1.php
On there it says
sendmail_from | no value | no value

Now, what file do I have to edit to turn this function on. And also what number is it to turn it on, 1?

 

 

 

 

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