You can find available rewards by clicking the Rewards tab from the Advocate View.
From here, you can turn any reward into a goal. To create a goal, simply click on the star beside any reward(s) you want to work toward to add them in your Wish List. You can choose as many as you like.
Once you have chosen your goals, you can keep tabs on those challenges and your progress in the My Wish List tab, right beside the All Rewards tab you were previously on.