To add tracking numbers manually please go to Dashboard/ WooCommerce/ Orders select the order you want to add the tracking number and click on the Edit Tracking button.
1. and 3. The Edit tracking button: Click this button to edit tracking information including: Tracking number, Tracking carrier, Shipping carrier, Change order status; then enable/disable sending email and/or adding tracking number to PayPal after saving.
2. Add a tracking number to PayPal.