The Queues Application is designed for managers who need to see at-a-glance information about the queues on the system that they have permissions for. If you are looking for the Application that is designed to allow agents to control their login/logout/pause status, please see the RESTful Phone Apps-Queue Agents guide.

The following screenshots were taken from an S500 and S700 IP Phone.
If you have an S400 the information is applicable however the phone's Display will be in grey-scale