Magazine Basic Margins

I have no skills coding or with HTML at all.

That being said, I would like to change the margins in this theme (Magazine Basic) so that my posts are not all crunched up together like they are here

http://www.oprosreviews.com/

I have played with and placed some items in the Editing area, and can find my way around and insert/delete items as needed. If anyone can tell me where to find the margins, and how to change them, it would be greatly appreciated. I’ve searched through the forum, and although the margins are discussed, no resolution ever seems to be presented.

Thank you for your help.