Froogle submission module is included into all new versions of the system.
1) Go to "Modules" menu > enable "Froogle/GoogleBase" module there
2) after this, you'll see a new option "Froogle/GoogleBase options" in "General Settings". Click on it to enter your Google Base information.
3) Go to "Import/Export" menu and click "Froogle/GoogleBase export"
4) click [Export] to create GoogleBase file with your products on the server.
5) click [Download] to get that file saved on your computer or [Upload] to send that file to GoogleBase server.