How to popup and change color

Hello,

I want to popup a text if data is wrong and want to change color in collumns same time.

I have an small example that shows text in cel if data is wrong buut it's not a real popup and it is not changing color of the wrong data.

I hope your the one that can help me out and help me with what I want. I have made my example in the add file.

Greetings