Go to Channel > Shipping Channel 

Click < Add a Shipping Channel >, choose FedEx

Input your FedEx account number (9-digit number), save.

Then go back to Shipping Channel page, click <gear> button

Input your default sender information and save

You can cross refer to the following photo

Done.

* If you haven't filled in sender information, then your FedEx account linking up process is not fully completed, label generation will fail.

Go to Order > Package profile

Click <create a new profile>

Choose "FedEx(online)" in Shipping Carrier, then select the shipping method provided by FedEx that you want to use, give it a name, then click <create>

Then please go to profile details and fill in all blanks and click <Save as> to save it as a new profile.

Then you are free to process orders with this profile.