Learn how to print onto a printable CD with your PIXMA MX922 printer.
Solution
How to load a disc
If necessary, detach the disc tray from the upper cassette.
Hold the sides of the paper output tray (A), and gently open it.
When the message asks you to load the printable disc, open the inner cover (B) and push it down all the way to the bottom. Don't insert the disc tray until you see a message that asks you to load the printable disc. Doing so can damage the machine.
Gently press the CD in place with the printable side facing up. Make sure there isn't any dirt on the disc tray. Be careful not to touch the printable surface of the CD or the reflectors (C) on the tray.
Insert the disc tray straight until the arrow on the inner cover is almost aligned with the arrow on the disc tray. Be careful not to insert the disc tray beyond the arrow on the inner cover.
The disc tray may eject after a period of time. In this case, follow the on-screen instructions to attach the disc tray.
Good to know
For additional information about printing on a disc, refer to these pages in the online manual:
Don't insert the disc tray until you see a message that asks you to load the printable disc. Doing so can damage the machine.
on the inner cover is almost aligned with the arrow 
on the disc tray.
The disc tray may eject after a period of time. In this case, follow the on-screen instructions to attach the disc tray.