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That process has to be two steps.
First, Scan the document into a file on your iMac computer.
Second, email it with the file you scanned in, attached to the email. That will get signatures to the recipient.
(If emailing is not appropriate, some other method, e.g. faxing over a phone line, would be needed. If you have no phone line, efax.com allows you to send faxes without a phone line, for a small fee. You may want to try it: efax.com has a free trial available at