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does your computer have a fax modem installed in it ? The feature won't work without the hardware. if you have an all in one printer that works as a fax machine you can also use that but to be honest if its only a couple of faxes its easier to print it out and fax it manually.
there are programs that will let you fax through the web but there is a charge to use them. However you can get a 30 day free trial and get the fax you need sent at least