Everything you need is located and arranged in layers in the ‘Layers’ section in the bottom right hand corner of Photoshop.
Layers that are highlighted red are ‘smart objects’ and are for adding your designs.
The layers are ordered so that they work together for the majority of scenarios. However, you might like certain elements to be behind or in front of another. For example, if you wish for the ‘5 x 5’ paper to be behind the ‘A5 Portrait’ paper then you will need to move the main ‘5 x 5’ folder so that it is underneath the ‘A5 Portrait’ folder.