Navigate to Settings -> Integrations -> FedEx and click on "Connect FedEx" button. You'll see the following dialog:
After entering your business information, you will need to select an authentication method. We recommend PIN generation as it's the most convenient one, but invoice validation works as well. If you're having issues with either of those, you can choose a "Technical Support" option, which will require you to call a FedEx customer support representative.
Contact Pilot support for assistance with FedEx integration at [email protected]