You can earn points within the 'ways to earn' section of your rewards panel. The social media (Like on Facebook, Follow on Instagram, etc) and birthday earning actions need to be taken by clicking directly on the panel. Points for creating an account (sign up), placing an order, and/or writing a product review will be immediately credited to your account provided that you are logged in and using the same email address as your store's account.
Note: All the earning actions listed under ways to earn will vary dependent on the store/site that you are purchasing from.