As well as a user manual available here, there is a YouTube channel for tutorial videos for the original 0.3 version, which can be found at:

https://www.youtube.com/playlist?list=PLySrjcxbIMorZDtc0wZZtCLrKiaqtZW9u

There is also a playlist for the latest 0.5 version, which can be found at:

https://www.youtube.com/playlist?list=PLySrjcxbIMopFvrRjEn7uduAsfNSX--b-