How to work with Auth->password()

I am using authentication components in my project. According to
Apress cake book i was able to make some action hidden from all user.
But while i gave password as a input, it doesn't take it and shows
that password is too long to be inserted into the password field. That
book also gave some instruction to use auth->password() function. But
i failed to use it corrrectly. Any solution???
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