Xerox WorkCentre 5330 Web Interface

Yesterday, a user was not able to email a pdf that she scanned because the file size was too large. We recently got this printer, so I tried going to the web interface to try and change the quality settings. They were nowhere to be found. I am wondering if this is because I'm not logged into the web interface with the admin user account, but unlike our other Xerox printers, there isn't a place to click at the top right-hand corner to log in. It just says "Local User." Also, I can't find anywhere in the manual about how to log in, or that I am even able to adjust the scan quality from the web interface. I ended up going to the printer, which is a rather long walk and I changed the settings from the interface on the copier. They were scanning 54 pages, and after tweaking the settings I got the file size down to 10 MB, which is right at the cut off that our email server allows. What I would like to know is, are these settings changeable on the web interface, and if so, how do I log into the admin mode to do so.