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/AVvXsEi9qMzgmIS8ipJZPBTV5gaPhYAFXtwauflZoPUGwhZRKzawav6tIUgFdp1zmmr6qZK3BsfZtPTRPRUYDsY1CWaRNFewe10rcqMgGInJckTsu2adLsb2uhnpqmud_aTZ6tzO71JHp0MiU0s/" 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..