Conference calls are important in any business. They are needed for better decision-making and planning.

To initiate a conference call:

During an active call, press the Conference soft-key (highlighted below in red)
The first call is placed on hold, a second line is opened 

Dial the second person’s telephone number and press the "call first button"
(highlighted below in purple)

When the second person answers, let them know they will be added to a conference call & press the merge button (highlighted below in brown)

All 3 extensions should now be in a conference call & the app will note this as "call in conference"
(you can also see the symbol is now changed)

You can end the conference by pressing the EndCall soft-key on the first call, however please note, when when you hang up, any other extensions on the call will be disconnected.