My church asked me to add a phone to their Nortel system, so I got them an M7208 and ran the cable... hooked it to extension 42. It's in the default mode now. I can change the features, but don't know how to put the three lines on the set. I've dug around the internet for hours and can't find instructions. I have the coordinator's password, and the Basic password. I can add and change features, but not lines? Can someone walk me thru this? Or tell me where to look? (There are over 600 pages on this thread, so it's probably here somewhere???)