When you have setup the Shiptheory Print Client, all the printers connected to that computer will appear in your Shiptheory account. You can view all these, as well as your printing settings from the Printing Setup Page in Shiptheory.
You are not able to remove a printer from this list as it is connected directly to the available printers on your computer.
If you have any questions about this, please get in contact with one of our support team.