Go to tellafriend.com and click on ‘Sign up.’ On the page you will find the button(you don’t have to sign up for it) Select your blog type (Like blogger), select the button and get the code.
Now go to your blogger Dashboard > Layout > Edit HTML.
Now click on the ‘Expand widgets template.’
Search this code,
Add the code after it to show the button below your posts, or add the code before it to show the button above the posts. Simple!