How do you add a border on pages for mac?

To add a border in Pages for Mac, first, open your document and select the page you want to add the border to. Go to the "Shapes" menu in the toolbar and choose a rectangle shape, then resize it to fit the page. Adjust the shape's fill to "No Fill" and set the border color and thickness as desired. Finally, send the shape to the back by right-clicking it and selecting "Send to Back" so that it acts as a border.