@記号用のキーボードキーを作成するには

ソフトウェア: Comfort On-Screen Keyboard Pro、Comfort Keys Pro

I am creating a custom keyboard and I want to add the @ symbol as a button. I don't see it in any of the built-in templates. Are there instructions anywhere?

You can add a new key with code 8C to your keyboard layout. This key does not depend on the input language.