Add a master-detail relationship on Stage that relates it to Festival

Can some one detail me how to Add a master-detail relationship on Stage that relates it to Festival. Please provide step by step details, which helps in my journey to learn and I know it was explained in lesson 1, but here if I know the steps will help me to progress. I was able to create all the fields as informed in the instructions with one extra field (checkbox)

Since my Stage (JDA) object is already related to my Festival (JDA) object I created a new StageDemo (JDA) object for this exercise. The video below walks through the process of adding a new master-detail field on the StageDemo (JDA) object so it will be related to the Festival (JDA) object.