Questionnaire (plugin)

I've installed the questionnaire module successfully on my own site, where I have admin privileges.

I persuaded the Uni admin to add it to the campus moodle site, where I am only a teacher. I can see the link to the Survey Managment phpESP, but clicking it gives a message saying:

"Incorrect User ID or Password, or your account has been disabled/expired."

What is going wrong and how can it be corrected easily?

Colin