Add subheader to post title and reduce padding

Hi, A couple of minor issues 1. I'd like to be able to reduce the amount of padding between the top of the page content area and the post title and between the post title and date and the first element of the post like an image or text, can I do this via custom CSS? I've tied it already but ended up breaking the layout... 2. I'd like to be able to add a post title subheader like in use here http://winsupersite.com/windows-8/going-pro-day-one-surface-pro (not Wordpress). I've tried the SubHeading plugin and configuring it within it's own settings but instead of the expected result of.... POST TITLE Sub heading Posted on 9 February, 2013 by User — No Comments ...I get this.... POST TITLE Posted on 9 February, 2013 by User — No Comments Sub heading ...anyone know how to fix this? Note:I would share a link to the blog in question except it's not live yet. I can add changes to a PHP file if someone can suggest which exact file and where and what change to add. I understand the concept of child themes but right now I don't have the time to create one so if someone has a quick fix for now I'd appreciate it.