For an explanation of the types of return service shipping labels, such as prepaid and Endicia Pay-on-Use-Returns, see About Return Service Shipping Labels.
Steps
From the Design tab, select Postage > Options.
Select the Premium Options tab.
In the Outbound/return label options area, select one:
Print only the Endicia Pay-on-Use-Returns (EPR) shipping label. The postage price is deducted from your postage account when the USPS scans the return shipping label, which would be upon return shipping from your customer to you.
Print both your shipping label and return shipping label.
If you select Print both outbound label and Pay-on-Use Returns label, click the Return Label Options button to specify values for the EPR shipping label.