How to change from absolute to fixed

Hi, so here’s my website
http://www.betterpurpose.com/passive-income-learn-escape-full-time-job/

I want the digg bar to stay in the same place when I scroll up and down. Instead it gets stuck on the top of my page, and I want it to stick to the middle like you can see in this example
http://www.highexistence.com/the-science-of-meditation/

Any help would be great!
Dvir

http://wordpress.org/extend/plugins/digg-digg/