Hi Edwin,
Have you fitted all your replies into the boxes or have you used additional sheets to continue explaining your problems? If you have used additional sheets, it should be easy enough to add your bit at the bottom.
If you have squeezed your replies into the boxes and have no room to add anything, I think you will have no alternative but to add a sentence just beneath the box, pointing the assessor to the supporting evidence.
Nothing on this board constitutes legal advice - always consult a professional about specific problems