The TNG Live install version 1.1.0.0 does not have the option to select the comport number when in 'serial' communication mode. This has been fixed in version 1.1.0.1.
The next update available on the internet after TNG LIVE 1.1.0.0 will be version 1.1.0.4. At the time this document was created (20111012) it has not be update to the internet.
Please use TNG LIVE version 1.1.0.4.
For install steps see install video on YouTube, use the link:
http://www.youtube.com/watch?v=QLswRJO08RQ