okies....
1) Upload your files into CSE, via FTPing into ftp.cse.unsw.edu.au
2) Start putty, SSH into CSE by logging into login.cse.unsw.edu.au with your CSE login and password. CD to the directory where you have uploaded your files.
Then, theres two things you can do (can't quite remember which one works)
Once logged in, type:
ftp
(This starts the FTP program)
open
(This tells the FTP program to open a new connection)
ftp.maths.unsw.edu.au
(This tells the FTP program to open a connection to maths)
Now login with your student number and your maths password, which you should have already set at the maths website. Use CD commands like in Unix to get to the directory you want, and use the put command to upload the files from CSE into maths.
OR
Once you've SSHed into CSE, SSH into sigma from there, and once you're in sigma, FTP into CSE, and get the files out of CSE into sigma with the get command.
You could always just bring it into uni the next time you're there