Conditional Statement Trouble

Hello,

I'm having trouble correctly writing a conditional statement for my data entry field.  I have a data entry variable field (vFirstName) that asks users to enter their first name. I need to write a condition for the "next" button so they can't advance without completing the task. Currently, I have: vFirstName != not eaul to 0

and I've also tried:  vFirstName != not eaul to blank

Neither works (sigh)! Does anyone know the correct commend to right to keep users from advancing without completing the data entry variable field?

 

 

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