How do I reset my security questions if I don't have a rescue email?

I purchased a new Macbook Pro and got a free student gift card with it. I need to buy pages and keynote for classes but can't use the card because I need to answer my secuirty questions, and I don't remember either of the answers. It says you can use your rescue email to reset the questions but I don't have a rescue email and it doesn't say how to set one up with an already registered Apple ID anywhere. How can I create a rescue account or reset the questions without a rescue email?