How to create 1/3 column on the right of every post?

I am using WordPress with theme Blocksy. I would like to add an 1/3 column on the right with some fixed content. This column should be visible on all posts. See this blog for example

• This topic was modified 3 months, 2 weeks ago by khalidinio.
• This topic was modified 3 months, 2 weeks ago by James Huff. Reason: link moved to proper field

The page I need help with: [log in to see the link]