You may conference up to 3 parties (you plus 2) using the following steps:
Outbound Conference
Call the first party.
Press "Cnfrnc" soft key (you may have to press the "More" soft key to see the Cnfrnc key).
Dial the second party.
Press the "Cnfrnc" soft key again and the conference is active.
Hang up when done.
Inbound Conference
Assuming you are on a call, you can add an incoming call to a conference using these steps:
Put the first party on hold by pressing the "Hold" key.
Answer the call from the second party.
Press the "Join" soft key.
Hang up when done.
Ending the Conference and keeping the callers on the line.
If you wish to keep the callers on the phone after the conference press the "Split" soft key.
Both callers will be placed on hold and you can speak with one party by pressing the line
key.