Hi! Thanks for the kind words, I’m glad it made you want to learn Sketch more. It’s an awesome tool!
Also, sorry for this late reply, for some reason I haven’t seen comments on my article :(
Regarding your question about why is it important to select the artboard instead of just the icon when…
Oh, I think you mean it wouldn’t work as the app settings icon. No, it wouldn’t and it’s not intended to anyway. The goal here is to show how you can make settings icon you usually need within the app, as a UI element. But hey, thanks for the comment, now you gave me an idea to make another tutorial for the app settings icon! :)