To the left is an image of the Product Visualizer Products TAB where you are able to choose from a preset list of products. These images have been grey scaled to enable you to add custom colors, which are selected under the Settings TAB, illustrated in the image to the right.
In section 1 at the top you are able to scale the product image, in section 2 add a color and in section 3 alter the position of the garment on the work area.