Just go to the Dashboard of your blog, on the left hand side click on Appearance tab>>widgets. Locate Blog stats click on it and drag it to right hand side on the sidebar. Click save. Now Blog stats widget is added to your blog. Visit your blog page and you will see on right hand side a number of hits your blog has received. These numbers would also be visible to the visitor of your blog whenever they will visit. Just a nice way to see how much traffic is there on your blog. Isn't it cool, just add it if you wanna know traffic stats of your blog.