Dashboard > Design > Edit HTML
click Expand Widget Templates
Press CTRL + F to find
When you've found it.. copy and paste this code
<link href='url for your cute icon' rel='shortcut icon'/>
if you don't have photobucket or filckr account, you can use your own blog for example..
or click HERE and HERE if you want to use my icon xD
(c) HeeBum and mumumeow