Copying a file from secure host to desktop

I have extremely limited programming experience so please go slowly!

I am remotely logged in to a secure network cluster via my username at my school through terminal. I'm trying to download a file from my account on the cluster to my desktop on a guest account on my mac.

I tried doing this: help.ubuntu.com/community/SSH/TransferFiles
where test is the name of the file i want to download, guest is my username on the computer I'm typing on (as opposed to my username on the server I'm remotely logged into), and myIPaddress is my ip address (the number string). (I had to put a space between the colon and Desktop because the forum was displaying it as a smilie face...it doesnt have a space in what i entered on terminal)

The IP I got by going to system preferences>network and the only options were AirPort (which doesn't have an ip address listed), Parallels Host-Guest, and Parallels NAT so I used the ip address for Parallels Host-Guest; then I tried going to AirPort then TCP/IP and using that IP address and I got the same error message

I get the following error message:
...help?

Moderator's Comments:

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