Not familiar with your printer, but on our WorkCentre 6515 you can log in either from the printer screen or from a networked PC.
On the printer screen, there should be a Log-In button, which should display the ADMIN login.
On the PC, open a browser and enter the printer's IP address in the subject line (HTTP://###.###.###.###) to access the printers webserver.
As I said, not sure if this works on yours, but its how we do it on the WC6515
I searched our online knowledge base and found this article that may be of assistance to you. If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797 or 1-800-835-6100
I want to change the default setting on my scan options. I first must "login as admin." I am new at this. How and where do I login as admin"?