Linux and OSX (Mac) are generally distributed with an SSH client included.

• Open a 'terminal' session.
• SSH to the relevant hostname
  • IITAC : login01.tchpc.tcd.ie  /  login02.tchpc.tcd.ie
  • Lonsdale : lonsdale.tchpc.tcd.ie

[jtang@duo ~]$ ssh -l jblogs lonsdale.tchpc.tcd.ie
jblogs@lonsdale.tchpc.tcd.ie's password: 

• Enter your password, as prompted. Note that 'jblogs' is a fictional username, you will need to replace it with your own name.