To get support for LAS Explorer, go to the Help menu and select "Report A Problem".
You can access the Log ASCII Standard 2.0 specification ("Las2_Update_Feb2017.pdf"), which was published by the Canadian Well Logging Society, from the Help menu. Note: The Canadian Well Logging Society is no more, check out this blog post for more information.
A great way to learn about the software is to watch these tutorial videos on YouTube. These videos are very informative - and short!
You can also access these videos from the Help menu in LAS Explorer.