You can add images to your project by selecting the white + sign in the editor which is on the left-hand side under the name "Pictures"
You can then select where you want to add your pictures from. From a folder on your desktop, from an individual file, from Instagram, from Facebook or a Flickr account.
Choose the option that applies to you. Note you can go back and add your photos from a different source each time.
You can add images one by one or from a folder that you can create and add to your desktop or you can access a USB of photos from this area also.
Once you choose your location you will be taken through to further steps which are simply selecting the name of the file or folder and clicking select.
Your images will then upload to the picture list.