1.Using Photoshop, open the image you want to use as the new Favicon
2.Make sure the favicon images is 16 pixels wide X 16 pixels high.
3.Save the image with the name favicon to your new destination and save it as a (.ico) format image. The file name should be ‘favicon.ico’.
4.Copy the new favicon.ico image file you have created to the root directory replacing the old favicon file