1. Navigate to Settings > Shipper Setup
2. Click Add New and choose 'USPS Endicia'
3. Enter in your Account ID, your Current Pass Phrase
4. Click Verify Pass phrase
4. Click ‘Save’
Other Tips for Setting up your USPS Endicia
Note Usage: Choose to include the shipment number or SKU number in the 'Note' field.
Click the ‘Options’ tab to set default settings for your USPS Endicia account such as default package type, default confirmation, default box dimensions and description