To add the tab for images simply add an image in the Images tab.
You can add an image to the images tab by clicking on the Add image button.
Once you click on add an image and select an image from your computer you will be presented options to select what you want in the image with the crop tool. You can also adjust what is selected by using the blue dots. To select the whole image simply drag the blue dots to all the corners.
You can also move the selection by selecting the move tool and then click and drag the blue box to a different part of the screen.