Go to Preferences, find and follow the link to API in the left navigation under Account Administration
Create a new key by clicking on the [Request Key] button.
Copy the newly generated Integrator Key and make a change in your code to include the Integrator Key as described in DocuSign's API Documentation here.
You’ll use this same Key for your Production Account once your solution has been certified by our Certification Engineers. Are you curious how you can prepare for certification? See our DocuSign Certification Steps post for details.
Do you still have questions? Feel free to contact your Account Manager to engage DocuSign Professional Services to help insure your solution’s timely deployment.