To send a game request to another user, you'll need to tap on the "Play" button on your home screen. After selecting the game mode, a new screen will be displayed from which you'll be able to:
- Select a random opponent: You will find the "Random" option to the right of "Invite Friends".
- Play with your Facebook friends: Keep in mind that by tapping on this option, your game account will be linked to your Facebook profile. By doing so, you'll be able to view the list of friends who currently have the app on their devices. By tapping on their profile picture you will be starting a new game with them.
- Invite Friends: You can use this option to invite friends who are not in the game. To do this, tap on the green icon on the left end of the screen. Once you do, different social apps will be displayed and you'll be able to invite your friend to the game. When your friend receives and accepts the invitation, they will appear as available to play each time you want to start a new game. If you want to invite another friend, you'll need to follow these steps again.