Front page category posts

Hi, I have just spent some time updating a test site of mine for the catch responsive theme before transferring to my normal site, only to find that the front page only contains the option to show "Your latest posts" or a "Static page" Does anyone know how I can change the code so the front page only shows a certain category of posts? I.e. just like a sidebar of category posts, but on the front page instead? I know how to change the slider, but not the front page. Thanks Andy