You can add text, watermarks, logos, or other images that appear in the same place in the background of every page of your document. These repeated elements are called master objects. The more transparent you make the object, the more it fades into the background behind the document content.
Tap 
in the toolbar, then tap Document Setup.
Tap 
in the toolbar.
Tap the button for the type of object you want to add, then tap an object (swipe to see more choices).
Adjust the size and position of the object on the page.
To adjust the transparency (opacity) of a shape, an image, or text, tap 
, tap Style, then drag the Opacity slider left to make the object more transparent.
To prevent the object from being moved or deleted accidentally, tap , tap Arrange, then tap Lock.
Tap Done.
The object appears on the background of every page in the document or section.
To edit or delete a master object, first unlock it.
Tap in the toolbar, then tap Document Setup.
Tap the object, tap , then tap Unlock.
Do one of the following:
Edit the object, then tap Lock so the object can’t be moved or deleted by accident.
Tap Delete to remove the object.
When you’re finished, tap Done.