scanning with xerox workcentre pro 255

Hi,

I have XEROX WORKCENTRE PRO 255. I want to scan documents with this machine so I read that a have to go to webtools to this machine so I used the IP adress en then I clicked on "propriété" and get this message 'authentification required'. i have to enter username and password, but I don't have this.

So please can somebody help me to solve this problem.

Thanks a lot

Sonia