and install the gogoCLIENT. For more information see this
If you are using the service in anonymous mode you shouldn't have to do anything. Just start the client and click connect. It should already be configured to use the server anonymous.freenet6.net
If you are using a Freenet6 account you will have to change the server and add your user account. The gogoSERVER should be set to authenticated.freenet6.net
and should add your account.