Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
This is not currently available for Magento GO according to the FAQ:
Q. Can I Use Magento Extensions with Magento Go
Magento Go does not currently support extensions. You will soon be able to extend your Magento Go online store with your own custom apps and with third-party apps with the Magento Go Platform which is currently in beta. Go to dev.magentogo.com to signup for updates.