First post

Thanks for the great theme. I love it so far. I just have a question about the formatting of the first post on the home screen. The width is really wide and I wanted to divide that in half to look like when you have the comments on the side. I wanted to put a rss feed block beside the first post. I know I can change it in the index.php but not too sure which div block to use. Can you provide any help with that?

thanks!!