Need help w/ TCP/IP and PPP direct connection

OK, first I want to say thanks in advance to anyone that can possibly help
me out. Here's the deal. I have used an ISP for quite some time, but when I
get to school, they say they have a direct connection available in dorms. I
buy the connection cord (I don't know what the official name is) that has a
telephone-type connector, but it is wider. That part connects to an adapter
that allows it to plug in to either the Mac's printer or modem port. I plug
it into my modem port which had previously been unused due to the fact that
I have an internal modem. The instructions have me put the PPP extension
and the ConfigPPP control panel in my system folder, both of which I
already had. I then put the correct server information into TCP/IP, and
configure ConfigPPP with a port speed of 57600 and flow control of "CTS &
RTS (DTR)." Also, I have my Modem Port selected, and "Terminal Window,"
"Hangup on CLose," and "Quiet Mode" are checked. OK, now what is supposed
to happen after I restart my computer and choose "Open" in ConfigPPP and
the Terminal Window comes up is the following. I am supposed to press
Return several times until the an annex prompt comes up. This doesn't
happen, no annex prompt comes up, and therefore I can't log in. The school
claims that the dataport is turned on, and whatever is happening is due to
my computer. I've never dealt with this stuff before and I've done all I
can do. The people on campus that are supposed to help aren't, and Apple
doesn't help anymore, so I'm desperate. Like I said before, I'd REALLY
appreciate ANY help.

BTW, I have a 6200CD and OS8