Canon MF8580Cdw Manual page 62

Press to scan or copy documents in color. In addition, if you press this key when you start printing images from a USB memory
device, printouts are printed in color.
[Start] (B&W) key
Press to scan or copy documents in black and white. In addition, if you press this key when you start printing images from a USB
memory device, printouts are printed in black and white.
[*] key
Press to switch the type of text that is entered.
Press to use tone dialing such as when receiving fax information services.
Numeric keys ([0]-[9] keys)
Press to enter numbers and text.
LINKS
Using the Operation Panel
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Entering Text
Receiving Fax Information Services