Question #1: Where is my API key?
You can find your API key at:
Question #2: How do I access the API data?
If you're asking this question, you're probably new to APIs.
No problem, we built our API Toolkit to help folks like you out. You can use the API Toolkit to "Get Data" and see example API calls.
If you like what you see and want to automate getting data from the API you should be sure to review the basics of how APIs work. Some useful beginner level introductory material can be found with a simple Google Search.