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 page elements. The more transparent you make the object, the more it fades into the background behind the primary content.
Page numbers are a great thing to place on the master page to ensure they are consistently presented.
Select an element.
Choose Arrange > Move Element to Master Page (from the Arrange menu at the top of your screen).
The selected element is removed from the current page and added to the master page. It's appearance will not change but it will no longer be selectable and will appear on all your pages.
Choose Arrange > Edit Master Page (from the Arrange menu at the top of your screen).
The user interface switches to editing the master page. You can confirm this in the Pages thumbnail sidebar, the single page there now has the name "Master" and the Edit Master Page menu item now has a check against it.
Add, edit or remove any elements to the master page.
When you are finished, choose Arrange > Edit Master Page (from the Arrange menu at the top of your screen) to return to the regular comic pages.
Choose Edit > Deselect All (from the Edit menu at the top of your screen) to ensure the page is selected.
In the Format sidebar the Page tab should be visible.
Uncheck the Draw Master Page Elements box.
The master page elements will disappear from the current page.