HighC is very easy to understand and to use, even if you don't know music. Yet, its novelty makes it somewhat unsettling to anyone who is used to other music software, such as mixers, soft synths or MIDI sequencers.
To help you discover its power, we suggest you first go through the tutorial: choose Help > Tutorial after having closed this dialog. In 20 minutes, you'll have a fairly good tour of its base features and its intended workflow.
If this is more time than you want to spend, you can also open one of the samples. These are short compositions ready to be edited. They can serve as startup material for a quick tour or for writing a review. The samples always remain accessible from the help menu.
To go further with HighC and support its development, you can register your copy to access its professional features, obtain support and have a say in its future evolution.