More info please? Is it a widget? or a code? Widgets need to be added on pages and a code may work in http://yoursite.com/admin/settings/page add it in custom tail code.

With the little info you supplied this is all I can offer in help

can also be the google code

If you want insert some code at the footer of the web pages, you can do that here: www.site.com/admin/settings/page at the custom tail code area. 

Here? http://www.salesforce.com/

yes, you need to replace site.com with your domain.