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
3. Access the API documentation
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.