Unless you have a fully customizable theme I do not think what you are seeking can be accomplished easily, as in with a two clicks and your done. You may have to get under the hood and tinker with the CSS and HTML of the homepage, and of your blog posts. If you’re looking for a resource for learning CSS I recommend w3schools.com. Otherwise, I recommend asking at your theme developers supportforum so the plugin’s/theme’s developers and support community can help you with this. Hope this helps!