Subscription form on website


I would like to create subscriber popup window on my website to add new e-,ails to my PHP List.

I created special public list for subscription with Id. And I used following code on my website, to add form wich I found in manual


I can see the Form but when I add an e-mail, it does not add to my php list. Where should I add my list id in code or what for code should I use, to connect subscription form on website with my real php list?