How to create If TextEntry = value(any and all text is acceptable)

On your Submit button that jumps to the next slide, add a condition that the value of the text-entry variable is not blank. That would look something like this: 

This is demonstrated in the attached file. 

Note: My example trigger includes an "Else" statement. If the text-entry variable is blank, it will show a layer with a message telling the user they must enter something in the text field.