When the game starts, press the pink "Play" button.
In the upper right corner, click the icon with three dots to open the in-game settings.
This will expand a menu with multiple options.
The icons from left to right:
Question mark: Help (Controls, Horse Care, Quests, Player)
Gear: Options (Game Camera control, sound control, Creative)
Horse: Riding Club
Address book: Friend List
Exclamation mark: Quest Log
Phone: Call For Pickup
Horse and character: Your Character and Horse Sheets
Camera: Photo mode