Quests can be accessed by tapping the Quests icon at the lower left corner of the screen, and will be unlocked after reaching Level 7.

You can also access Quests when you are in any Slot machine by tapping Features → Quests.

When you enter Quests, you will see the challenges that you need to complete to earn rewards.

Quest 2 will be unlocked after completing Quest 1. You may not skip a Quest as it needs to be finished in order.

If you have completed a certain task, this will be indicated by a red shield in your features menu.