Your Ubuntu Appliance will be added to your Ubuntu cloud account and use your SSH keys to identify you. Add your keys to your account at https://login.ubuntu.com/ssh-keys.

To do so, run the following command in your terminal, which will copy your public key to your keyboard.

type ~\.ssh\id_rsa.pub | clip.exe

You can then paste your key result into the text field on your Ubuntu One account. Click import and will have the key set up.