A "favicon" is a little icon in the address bar of a Web browser that appears to the left of a website URL that was visited. A customized favorite is used by many websites to add a professional touch. Google's blogging platform, Blogger, allows its users to showcase their blogs with favicons. The default icon is the official Blogger logo, however, it can be replaced in several easy steps with a custom favicon.

First

Go to blogger.com and log in your account

2nd


Go to settings>favicon and then upload your own favicon

3rd

upload your icon. recommend resolution for favicon is 150x150 pixel
note: if you don't know how to resize your own image you can directly use online resize