Computer Faxing via an AIO Printer

I have a Studio 15  with no modem and want to fax MS Word or Excel docs using my V715W printer. I have a home network set up with the printer on it and have no trouble printing from my computer to the printer. Also, the printer is iseparately identified in "Devices & Printers" for faxing.  I've attempted to fax and was asked for "the network address of the fax server" which I must enter in order to proceed with the connection. I don't know what this network address is or where to find it. Faxing directly from the printer works fine and I was told by Dell support that it can be done directly from my PC.  Can someone help out here? Thanks!