VicBob,
Can we assume you are referring to Meet-Me-Conferencing? If that is the case then just create the application by going to System>Devices and Features>Assistants then right-click on the application side and select the Meet-me-conferencing assistant.
If you have not done it yet you will also want to change the conferencing type from basic to advanced to allow for more conferencing circuits.
Also, by default the users extension is their conferencing access code, but they can set up others.
Thanks,
TE