To select the recipes to be included in your printed cookbook, start by going to the Index of recipes by category.
The checkbox next to the recipe name is to include it in this edition of your cookbook. If it is not checked, your recipe will not be included in your printed book. By default, all recipes are included. Click Edit for a single recipe and check/uncheck the box for it in the recipe detail. You can make wholesale changes from this screen by making your selections, then scroll to the bottom of the page and click the "Update Selections" button.