Tammy, what you need to do is sign into your blog and go to Layout.
There you'll get a bunch of squares where different things are located. On one of the side columns (I think you only have the right column on your blog), there's a light colored box that says "Add a gadget" and you'll get another window with a list in it.
Choose HTML/Java Script and add the information (HTML code) for your counter in there - label it so you know what it is when you go to your Layout page. From there, you can move it around the web page.
I got my counter from
http://easyhitcounters.com
Hope this helps.