In authoring, there are two buttons on the lower left of the screen you can use to add a new page.
Button 1: Click this button to add a page with the last activity type you had selected. For example, if the last page you added was a Build-a-Book activity, you can click this button to another Build-a-Book page. Please Note: This button will not be immediately available when you reopen an existing lesson. You will need to add another page using Button 2 before this button becomes functional.
Button 2: A popup will display when you click this button listing the available activity types. This is similar to the dialog which displays at the start of authoring a new lesson. Hover your mouse over the activity you would like to add then click OK.