14671 Form-mail with return-path

Hi, I need a programmer quick. I have a problem with my form-mail script which the return-path is not the user whom key-in their e-mail. Instead the return path is my own e-mail. I don't know PHP so i don't know where to add/edit in my existing script. I was told it's a very simple fix. I need this so that my support system (kayako) will accept my formmail