Adds a subscriber to Campaign Monitor using their API

I need to add subscribers to my campagin monitor lists using a form if visitor checks a checkbox "add me to your newsletter list one" or "add me to your newsletter two" then the visitor is added to the list he choose, if the visitor does not checks any of them then the form just sends an email with the data on the form.. This is the perfect example of this [login to view URL] Here is the documentation of the API [login to view URL]