Google feed API

Hi,

I want to use google feed api can somebdy tell me how to use it
they give instruction in the following link
http://www.google.com/uds/solutions/dynamicfeed/reference.html#_customize
but m bit confused like they are asking for the API KEY i signup for
the key their they ask for my url but rite nw m not running my site on
any server so how can i give url...

somebdy clear my confusion.

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