How to use Blocks editor?

Ok so I was kinda excited to find a Arduino emulator and kinda like the Blocks editor since I'm new to programing. But now I genuinely have a headache from this. Why can't I enter in a IF trigger? I drag the If/Then (under control) onto my code and I see a grey diamond but I can not drag anything inside... I can not double click it... I can't type anything in it... I can't type anything in the code... Is this just useless or not working or broken?! There is NOOO instructions on how to use blocks on the website unless I missed it, I looked all over!!!!  So frustrated... Is blocks just broken or is there some strange way to use it?


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