Smush Pro - images sent for smushing

I have installed your Shush Pro plugin some time ago now and while installing I have sent 12 images for smushing. I have also market the default setting to smush the newly updated images.
None of these work for me.

Can you please guide me how can I smush my images to get it working
as described in your product description (image optimization of up to 60%).

Regards

Jaroslaw Remesz