PZ1, thanks for your help! I fully understand installing new apps now. As far as the scenes is concerned... There is no "scenes" app on my Razberry, but a "Light Scene" (and "Scheduled Scene") (I'm not picky here, don't get me wrong, just trying to make sure I follow your thoughts correctly).
With your explanation on mind, I think I understand now what confused me in the beginning: I had, of course, looked at that app before and stumbled over the last option "list of scenes to activate", which was empty. I now realize that this last option refers to other "Light Scenes" to daisy-chain such scenes together. Now it's clear why this is empty in the beginning. My fault was to look for
another option to create scenes that would then
need to be selected in this pull-down.
Testing this, I think I found two bugs in v2.0.1 that I'm using: Creating a scene with a dimmer (a blind in this case) and giving it Name, Description and Level. Editing that scene again has the Level field empty, i.e. it's marked in red as "this field is not optional". Also, the scene is only identified as "Light Scene 6" (6 in my case) in other fields where scenes can be selected - the Name is not visible there, making it a bit difficult to identify, especially in more complex scenarios. But I'd say that I should file a bug report for that one (or check if it isn't already in the bug-list).
Thank you both for your assistance - I think that got me started pretty nicely!
(Still, if anyone ever finds a full user manual / tutorial for this, don't hesitate do update this thread

)