How to configure software to use SSH tunneling.

Download and install PuTTy - free SSH client for Windows: http://www.chiark.greenend.org.uk/~sgtatham/putty/ or other SSH client for Windows. Though if you have Unix server probably you already have some SSH software installed on your Windows workstation.
If you do not have configured SSH connection then create one and check it against SSH server. (Check the documentation for SSH software). Add SSH tunnel to your new or existing SSH connection profile. Save changes.

Source port - it is the port that used by PyTTy software to listen to incoming FTP connection on your Windows workstation .
Destination - destination is a combination of address and port where FTP connection redirected via SSH channel on Unix server.

Run SSH session. Create new FTP connection and test it.

Create new or modify existing profile.