Email marketing/membership

Hi, Currently i am using the s2member plugin in order to block access on a couple of pages on my site. I have also recently created an account with mailchimp to start creating a list. My question is how do i integrated mailchimp with the s2member plug in so that every time someone subscribes with my wordpress site to become a "user" and get full content access... how can i capture their information and export it the the mailchimp list?