Choose your picture mount, this option is optional. The mount will make your frame size bigger and you can choose from a single mount or double mount. The mount will enhance your artwork making your picture stand out more and pick out certain colours and shades in your picture. There is also an option for how many layers you want? This usually works with a top layer and thin layer for the bottom layer.
You can combine different colours for the top and bottom, better to play around with it and see what you think. There is adjustable button for the bottom layer where you press "left and right" to see the different thickness of the lower layer or manually enter the measurements you want all the way around or different on each edge. These measurements are in MM. You can also choose the mount shape to be rectangle, square or oval.
If you decide not choose a mount, simply press the "No Mounts" and move to the next step.