VIA
There should be no problem with your doing it but I would not do it excessively or you will lose the impact. Also, your form will be scanned in black and white which often loses the marks from a highlighting pen so you would be best to use bold or underline if you are typing your response, you could use italics for a paragraph, or underlining or capitals if you are writing your response.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
