Canon LBP7210Cdn Manual page 310

Click [OK] or [Print].
The printer starts printing.
Adding, Editing, or Deleting a Watermark
Display the [Edit Watermark] dialog box.
(1) Display the [Page Setup] sheet.
(2) Select the [Watermark] check box.
(3) Click [Edit Watermark].
NOTE
If you cannot select the [Watermark] check box
If [Spooling at Host] in the [Device Settings] sheet is set to [Disabled], [Watermark] is grayed out
and cannot be specified.
See "Changing the Setting for Spooling at Host"
[Auto].
Add, edit, or delete a watermark.
Adding a watermark
(1) Click [Add].
(2) Specify the settings for each option as needed.
and change the setting for [Spooling at Host] to