Completing themed missions will allow you to collect exclusive pawns and frames by answering questions on specific topics in Mountain Track.
Once you finish a mission, you must enter the "Missions" section, selecting the map icon from the main screen. Once there, press the "Themed" tab and you will be able to access the list of active missions. When you locate the mission you have completed, you will see the "Claim" button on the right side.
After claiming your prize, you can find your collectible in the "Inventory" section. To equip the pawn or frame you want, you must select it and press the "Equip" button that you will see in the upper right corner of the screen.