Hello!

Open the Friends screen by tapping the orange people icon in the bottom left corner of the screen or by tapping the bus stop outside your zoo.

If you like to play ZooCraft with your friends, you can find them in the game by their Player ID in the "Search" tab, (the Player ID looks like UXXXXXXX and is located in the bottom left corner of the game settings screen.)

You can send friendship requests while you're visiting other zoos by tapping the "+" button located in the top left corner of the screen.

You can also accept friendship requests in the "Pending" tab of the Friends screen by tapping the green button with a checkmark icon.