Sending forms on a web page

Hi this is probably a really dum question but how do you send emails on a web site like an email form wihout using outlook express. I have a couple of forms on my webpage and when i put the links in and click submit they always load outlook express.I am hosting with brinkster at the moment and i believe they don’t have mailing servers to use can anyone suggest anything. Can you please keep it simple aswell as i am not the most advanced user of html..

Cheers