1. Tap Menu

2. Tap Games

3. Tap Filter, then select the filter parameters and tap search.

You can also use the Quick Search field to quickly find games by keyword

4. Tap the Game you want to share.

5. Tap the Share button on the lower right corner.

6. Tap the circles next to the people who's itinerary you want to add this game to

Now you can see that those people have been added to the game.