This article will teach you how to add your accounts for shipping carriers, such as FedEx and UPS, to Sellbrite
To create shipping labels in Sellbrite via a shipping carrier other that USPS (ex. FedEx or UPS), you will need to add your carrier account information. Any labels you purchase will simply be charged to the carrier account you've added.
To add your shipping carrier accounts, go to the Settings > Shipping Carriers page, and choose the carrier you wish to add. Enter the requested information and click the Add Account button.