Firstly, sign up for a free trial account, make sure you've chosen "developer" as your role in your profile settings.
Once you've logged in:
1. Click the API tab
2. Hit the toggle to turn the API on and you're ready to go
4. Navigate to our classroom API and click 'Try it'
Note: To start testing out our API, you do not have to download anything; everything is hosted by us so it's really easy.