How do you send a fax using the lexmark all-in-one?

I have a Lexmark X7350 All In One. To fax, you put you sheets on top face up, make sure the "Fax Mode" button is lit up, key in the fax#, then press either the "Start Colour" button or the "Start Black" button, depending on where you want the image sent in colour on the other end.

Faxing from the computer? I'm still looking :(

Lexmark really sucks compared to HP.