Hi Carlos,
This line of code is already in CMS Builder:
<link rel="shortcut icon" href="favicon.ico" />
You should be able to just put your favicon.ico image in the CMS Builder folder on your site and it will automatically appear.
Note that this was added in CMS Builder version 2.50. If you are running an older version, you can upgrade here:
http://www.interactivetools.com/order/upgrade.php
Cheers,
Damon Edis - interactivetools.com
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