Favicon is a small logo that you can found before http:// at your address bar. Now you can use your own image To make it as your favicon.
First prepare the image and crop it into 16x16 pixel.
Then upload your image into your image host.
Open your HTML, then paste this code inside head tag.
<link href='http://yourimageURL.jpg' rel='shortcut icon' type='image/x-icon'/>
Save your template.
If you have some problem with croping image, try this faveicon sollution.
If you have some problem with image host you can try the next article inside this blog.