Make changes to thing - show an alert message

Help I am getting desperate. I have been trying for hours to make this work to no avail - and I don’t understand why.
What I am trying to achieve:
To save the content users enter into data fields (make change to a user) on a popup. If any field is left empty to show the alert message. Here my workflow. Please help

Try changing all of them to refer to the inputs values instead of the dB (… current user is an “entry” in the dB)

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I am going to do that right now - and I believe this will work - somehow I forgot the basics!!