You should be able to drag the text widget from the list of widgets on the left into your sidebar. Read your blog hosts documentation on how to edit your site template.
You're about to join over 1 Million site owners around the World who use Feedjit to improve user engagement and create a live surfing experience. When you are ready, sign-into your website and edit the template for your sidebar.
The feed on the right-hand side is your sample feed that you can use to customize what your Live Traffic Feed will look like. Look at the structure of other elements in your sidebar.
The data in your sample feed is actual live data showing people visiting right now. Note that this version does not update in real-time because it loads as a static image.
If the above doesn't work, you can sign into Blogspot. Then click the "Layout" menu on the left and click "Add a Gadget". Give the Gadget a heading, copy and paste the code below into the body, hit Save and you're done.