How can I invite friends?
In the "Profile" section you can tap "Refer and Earn" and invite your friends using any of the social apps installed on your device.
Over which method can I invite my friends to Vegas Sunrise?
The methods for inviting friends are dependent upon the communication/social apps that you have installed on your device.
Can I also add friends who are already using Vegas Sunrise?
No. To earn coins along with a friend, they need to be new to Vegas Sunrise.