After the software has been installed, a new window will appear where you can check all the instructions for this software.
I've downloaded the latest version from its official website and after the installation finished, a new browser window opened with all the instructions provided.
Here is the official website: http://www.hottnotes.com/
Here is the location of the how to use file, after installation:
C:/Program Files%20(x86)/hott notes 4/help/howtouse.html