1- Go to Twitter Button Website
2- Choose Follow from the four options as shown below
3- Now in the Button options, Enter your twitter username in User field as shown in below picture. You may check Large button to increase the size of twitter follow button.
4- Copy the button code which is on the right side under the title Preview and code in small box below your twitter button as highlighted in Red in the picture below.
5- Now your twitter follow button is ready to be install on your blog. Login to your Blogger Account
7- Paste the code copied in the box
8- Save and now you have Twitter Follow Button on your blog.
Don't forget to share this post to your friends by clicking the sharing buttons below.