Favicon Guide:
Create the Favicon using our Favicon Generator, or in software such as Adobe Photoshop (just create a 16 by 16px image and save as .ico)
Rename the file to favicon.ico
Put the file in your root directory
Add this line to your pages:
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
Change /favicon.ico to wherever your icon is located