The more your engage in your program the more opportunity you have to earn rewards. For Activities and Paths, there is a "Join" button that you can click for the events that you've been invited to. Once you have completed these activities you will see credit for completion in the MY POINTS.
Please note, that the amount of Points or other type of reward associated to these activities, and how often you are able earn it is specific to your company.
Check out the "About the Program" page or the "How to Earn Points" page on your account for more information about how to earn Points by participating in challenges! Also, be sure to read through the rules of each challenge to understand how points are awarded - some challenges award points as you go and others may have other schedules associated with them.