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To chose tutorial click on the "Tutorials" button in the navigation. You will see a dialog box, inside its content
you will be able to preview all different tutorials.
Each tutorial has name, description, level and tags. The easiest tutorials are with
one star for their level, the most complex tutorials are with three stars.
Using the search bar you can filter the tutorials.
When you chose a tutorial just click on it and its first step will be opened.
The result will be visualized in the bottom-right corner.
In order to change the theme to dark use the black box, left from the "Help" button. To restore to the previous theme use the white box.