Our designer currently has two recipe page layouts that allow two recipes. If you want to add a second recipe to an existing page, start by clicking the edit button (pencil icon) next to the page. On the "layout" tab select either the "Two Recipe Page" or "Large Recipe Top/ Small Recipe Bottom" page layout.
On the "second recipe" tab you can add another recipe. If the recipe that you would like to add is already in your account, click "existing recipe" and search for the title. Recipes that already appear in your book will appear with a strikethrough- when you select that title the recipe will be moved to the current page.
For more information on the two-recipe page layout, check out this help article.
Here's a quick tutorial on understanding the two-recipe page layout: