You can earn rewards if your friend starts playing Empires & Puzzles via your invite link. Generate your invite link by clicking on the invite button found in your Inbox under the Invites tab.
Invites are successful when your friends reach experience level 10. You can then claim your rewards. Your friend will get 100 gems and a free 10-day VIP Pass by reaching experience level 5.
Please note that this feature is still in beta. Due to the nature of the feature, it needs to be tested in a real environment. Thank you for your patience and please feel free to give us feedback and report any issues you might be experiencing