Instructions for this level:
There are sometimes extra fields that are hidden or added to the form which contains a little extra information for the login script. This will be very easy for anyone to gain access to as it is shown in the page source code. Once in a while these fields might contain some information that also might be helpful to you. Linke XML Files.
So if you look up what a .xml file was. XML file extension is an Extensible Markup Language file. They are plain text files that don't do anything in and of themselves except describe the transportation, structure, and storage of data.