That's all what I've found out:
First go to one of the three patterns windows and type a name for the pattern (e.g. "first").
Go to the most right side of the line where you typed the pattern, press space, and an arrow will appear (in the attached picture it's "1")
Select "Set" ("2" in the picture) so you will be able to edit the content of the pattern you set with the arrow.
In the 3rd step you have to type in the name, length and envelope of a note but I don't really understand how...
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