1. Navigate to Purchase > Purchase Orders and choose the specific purchase order to update.

2. Click on Receipt

You will see that it is in the Ready status.

3. Click on Additional Information

4. Add the tracking information in the Shipping Information

5. Click on Save

6. To check, navigate to Inventory > Receipts

From here, you will be able to see the tracking reference you entered.

You can also watch these videos for reference:
https://screenpal.com/watch/c0h3QoVAaPx
https://screencast-o-matic.com/watch/c0i1hcVgU3H