Presuming that you are using the current stable (1.11.0 as of this response)
If you want to do it for all Agents:
Go to: Admin panel -> Settings -> Tickets
Click on the Queues tab
Click on the Queue that you want to modify.
Click on the Columns tab
Add the column that you want to add.
Click Save Changes.
If you want to do it for just you, I would recommend making a custom queue.
On the Agent Panel.
Mouse over the Status that you want to add the queue to.
Select Add Personal Queue.
