Visual Captcha Refresh: I would like to edit the instruction

[Allen]

I need to edit the registration page regarding the captcha. I would like to add text to the captcha instructions regarding the required page refresh to get a new captcha image. Or possibly even add a image refresh button for the captcha. Where do I find the file to edit this area?

My apologies if this was asked before but I could not find an answer in the forums.