Adjust Captcha Code

My wife is adding 'minteye' captcha code to our login and registration pages. She has added the registration page and it works very good. But she seems to have done it wrong on the login form, and can't seem to figure it out. The login form when captcha is submitted it fails. It is something to do with the original captcha code, that checks that is correct and allow login. She does not know where to put that code in the new captcha system. I can only afford $30 for this, it is all I have in my FL account. Will prefer bid from people who know captcha coding very well.