Currently, this MobileNote feature (actually you can call it as a service) is still under beta testing. So only invited users can use this feature.
However, if you're an invited user who is already using this MobileNote feature, you can invite your friends to this feature as well.
To invite others, you need to first identify yourself, by entering your MobileNote email address.
Your name will be used in the invitation message. Don't enter your passwords here.