Hello Gab,
here are the steps that I made to integrate a Google mashup:
1. I created a API Key according to this introduction: http://www.labnol.org/internet/rss-feeds-for-google-searches/19944/
Image may be NSFW.
Clik here to view.
2. I created a RSS/Atom Mashup with the API URL:
Image may be NSFW.
Clik here to view.
As you can see I can not simulate the output parameters. The problem is the API Key. It can not be found. And I don't know what I made wrong.
Hope you can follow my steps.
Thanks & regard
Suita