Problems with wordpress integration

I’m trying to integrate wordpress into an existing site. I want my viewers to be able to view blog entries, leave comments, and subscribe without leaving my site’s homepage. I’ve managed to achieve the first of the three goals, but the others have me stumped. I admit that i’m not an experienced web designer and I know absolutely zero about php. Here’s a link to the site; can anyone help? Hosting is ipage, if that makes a difference.