Intrepidity Optin Form

Hello,
I am designing my site using the intrepidity theme. At the top right corner there is an e-mail/optin/sign up form. How do I configure this form to send me an e-mail once people have entered their details? I have installed the auto-responder plug-in and scoured the topblogformulasupport website, but I am still clueless. If anyone can give me some advice or a simple step by step process I would greatly appreciate it and be forever in your debt.

Many thanks in advance,
Ben Haines