Go to orders and click Manage orders
Make sure the Item you want to track is marked as Shipped the option to do this is under the actions drop down menu. Note it the mark as shipped option is not available make sure it is marked as picked first.
Fill in the required data and check you have the correct box ticked to send the details to the correct place. Then click save
You have successfully added tracking details to orders, Ebay will then automatically Email the customer an item despatched email with there tracking details enclosed.