As an aside, I have access to the Amazon AWS / EC2 environment but am clueless as to how to start up an Instance along with front-end tools like SQL Assistant. I have read a bubch of documentation but it still does not make sense to me. Hence, I am using the Studio Express VM.
You can run Teradata Studio Express client (successor to SQL Assistant - Java Edition) within current versions of the Teradata Express VM. You should will see the icon on the virtual desktop once you log in to the VM. Or you can run Teradata Studio or SQL Assistant natively on your laptop and connect to the Teradata Express VM database. If you have further questions, please specify exactly which version of TD Express you have.
(Note that the article you linked dates from 2009, though much of the information still applies.)