Canon PIXMA MX300 Quick Start Manual page 16

(16) OK button
Finalizes your selection for the menu or setting item.
Dismisses the error message and resumes the machine's normal operation after
resolving a printing error or removing jammed paper.
(17) [ (-) and ] (+) buttons
Scroll through menu selections, and increase or decrease the number of copies.
For the fax settings, [ cancels the entered character, and ] enters a space between
characters.
(18) Back button
Returns the LCD to the previous screen.
(19) Settings button
Configures the page size, media type, and image correction settings.
(20) FAX Quality button
Sets the scan contrast and resolution of the fax you are sending.
12 Operation Panel