On the Survey/Form Settings tab, the the Show survey/form on a single page checkbox must be unchecked in order to utilize logic with your questions.  

If you have already created the question, when hovering over the question with your mouse you will notice the Add Logic button.

The Add Logic button allows you to direct your survey taker to a specific question according to an answer that they provided. For example, if they were dissatisfied with the service, they can be directed to a question asking what they were dissatisfied with specifically. If they were happy with the service, they can be directed to the next question, and skip the more specific question. This allows for a truly customized experience for your audience. 

If you have not already created the question, you can add a follow-up question based on the answer provided. For example, if they answer Yes to the question below, they will be directed to a question to rate the quality of the class. If they answer No, they will go directly to the next question.