How Does this Work

I'm not as computer savvy as I thought I was. A few of the blogs I read have these cute little signatures at the bottom. Well I finally got to the sight you get them from. The only problem is I can't seem to figure out how to get it to show up on all of my posts. If you are more computer savvy then I am HELP!!! I got it here on this post, but next time you never know:)