You can download Putty here.
Activate unix access on account.jyu.fi. Instruction: How do I activate direct access?
Connect to the server jalava.cc.jyu.fi or halava.cc.jyu.fi.
Log in with your University username and password.
After connecting to the remote computer, you can give unix commands. For guidance on remote access and unix commands, see the Department of Information Technology's self-study material Sormet on unix.
If your intention is to transfer files between your home computer and the U:- disk, we recommend using WinSCP File Transfer.