I cannot figure out how to use my fax machine. I do not have a phone handle with it, Ijust have the phone cable plugged into the back of it. Does it have to be in any certain plugin in the back, because there are 2. I used it once and I havent been able to use it since. After I put the number in it says enter fax number after it scans the pages. Im at a loss here, would appreciate help, thanks Michelle