Most in-game content for Prince of Persia: The Lost Crown will become available after you complete the tutorial and reach the first Wak Wak Tree.
 
Your content can be found in different places in-game:
 
Any Amulets you have purchased or collected in-game are available in your Inventory. To access your amulets, interact with one of the Wak Wak trees and choose "Amulets".
 
Skins can be applied from the Character menu.
 
Maps bought from Fariba can be found on the world map.
 
If you are unable to locate any of your content in-game, please make sure it is installed on your platform.