Changing Favicon

What is favicon? it is an image on left side of the web address.
On this tutorial you will learn how to change this

into this:

Requirements:
1. Any image editor such as Adobe Photoshop.

Steps:
1. Create icon file in 16x16 pixels and 72 dpi.
2. save as favicon.ico
3. Using ftp or any file uploader, upload or replace the existing favicon.ico with your newly created favicon.