After being invited from within the app, they’ll receive an email with login information and instructions on downloading the app. Please note, the notification email your friend or family member should receive is simply a notification that is sent out when you add a friend to your child's profile. The CloudPets Online service sets up the friend request on the server, so even if the friend invitation email is never received, the friending process can be completed from within the CloudPets App. Once they complete the login process, they’ll be able to send messages to your CloudPet. All message must be approved on the local CloudPet app before being delivered to the CloudPet.
Visit this link for Adding Friends Instructions.