1.Login to your Bogger Dashboard and go to Design >> & Page Elements.
2.Click on 'Add a Gadget' on the sidebar.
3.Select 'HTML/Javascript' and add the one of code given below
<img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2J_UFRQ_wqvlG2BWYRYp4QDfIgjAboVJJWDXCFf63youCR045Sgf7PaZ24d6fHPg_t4ckGQaUW5v9meSjM6gp2-4rKWF4nC_dGfU-WiD8JIVnfq5PCdCdDlyrMUNxleBJGAx0N4rT_GA/" width="125" height="125" alt="Blogger tricks and toolz" />
Look at the example below:
4. Now Click on Save "Html Java Script" and You are done..