Mismatch between Pin Planner Assignment and LED-Display Result

Alright, I have to ask some basic questions now.

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You have to comment the respective port entries to prevent Quartus from assigning pins to them.

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Where can I do this (and how)? I was looking for a place I can do this but no success yet.

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If the signals are accessed in the design, you can also declare them as virtual.

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I tried to delcare the databus pins as virtual in the assignment editor but it was unsuccessful. Although one LED stopped turning on whilst operation others keep turning on (I doubt my declaration had any effect on the malfunction since the assignment entry kept unchange in the .pin file). So here again, where can I change the parameter of the assignment (and how)?

Thank you