Here is the process for adding a tracking number to your order manually using Listing Mirror! Note, if you have ShipStation integrated with Listing Mirror, this would not apply to you!
Go to the Order Details page for the order you want to add a tracking number to.
Click the Action drop down menu and select Enter Tracking Data.
Enter in the Quantity, Tracking Number, and Shipping Carrier in the corresponding fields, then click Add Tracking Info.
And that is all there is to it! LM will send that tracking data to the marketplace and update the order there!