Hi all. I managed to finish this mission, took me quite a while. Newbie here anyway heh.
The 'open a html file in Desktop and see the url' is a great help. Thanks!
I would like to ask a few questions, hopefully it's not much of a spoiler.
I manage to use the ***:/// parameter and found the admin page in the webserver. But the thing is, the end extension is *.html
But when we are in need to access the login page, why do we need to change to another extension besides html? I have no idea, or is it the way that everything in cgi-bin folder must be that extension? Anyone? Or I'm just lucky to bang the correct input?
Thanks in advance!

*hint* Oh yeah, changing the parameter in the url in the student's workpage made me understand the page itself, and it worked out from there.
-- and no I think the user and pass in the txt area is done by members itself -_- --