PuTTY is a free/open source software SSH client, commonly used on Microsoft Windows systems.
Webpage: http://www.chiark.greenend.org.uk/~sgtatham/putty/
Use the information available here to log in to our server.
You probably want to save the session for later use, choose a name and click "Save". Then you can just double-click on the session name next time you want to connect!