Feedburner and Live Chat

I had a web developer create and install my website, but there is no follow-up support available. My Feedburner has never worked, so that every time I change a post or add one, no one is able to get an email notification of any updates to my website. I would like to know how to get feedback to visitors to my website who want to stay informed about job postings.
Secondly, I would like to know how to add Live Chat to my website. I was told any high schooler would know, so if there are any out there, I would appreciate the advice! http://www.brannanlegalsearch.com