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Hello PRS0895,
I understand that you want to type the @ character on your German keyboard.
As a fellow user of the German keyboard, I can understand your confusion with this button combination. This is how you do it: press and hold Ctrl and Alt (Strg and Alt on the QWERTZ German keyboard), and then press the Q key. This should type the @ symbol.
Please let us know if you have any more questions.
Best Wishes,
Zack_T