You can add photos to the front of your cookbook a couple ways.
1. You can upload a photo per page using the Cookbook Picture Tool. Go to Editor Activities>Photo Center. Click on Cookbook Picture Manager and you can assign photos to the Editor Messages.
2. In the text of your messages: Click the insert photo icon (second row of buttons, 5th from the right). Upload a photo (upload tab), choose file, send to server. Set the width to what you'd like. Full page is about 675. Click "Ok"