Text Entry Interaction - How to "reset" after incorrect entry

Hi Katie and welcome to Heroes! 

Is it a standard fill in the blank/text entry question type - if so, you could enable the attempts from within the question, and the user will see a Try Again layer, and be brought back to the question to retry it. Their previous answer would still be visible, but they'd be able to enter a new answer. You could also set a trigger on your incorrect layer to "jump to slide - the text entry slide" and set the slide properties for that slide to "reset to initial state" so that it would be treated as a brand new visit and the box should be empty and they'd be able to progress again. 

If you're using your own custom text entry, you'll need to add a trigger to reset the variable.