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It depends on your keyboard settings. It's the key that prints §, I believe. It's shift-3 on my (German) keyboard.
 
I'm moving this to the HoI3 forum where it belongs. You should register your game so you can ask these kinds of questions in the tech support forum the next time.
Try whatever key you have above the tab key, that usually works!
 
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For me on my Hungarian keyboard, it's 'Shift+0', but when it turnes into the English layout (sometimes it does that for some reason) then it's '0' without Shift. And '0' is the lefternmost button on the top row of my keyboard (excluding the row starting with 'Esc').