Creating a Short Answer in Articulate Rise

Hello,

 

How can I create a short answer feature in my articulate Rise course? I'd like individuals to be able to submit thoughts on a question, but there's no correct answer. When creating the course, I tried the "Knowledge Check" feature and left the 'fill in the blank' part empty, hoping that any answer can be accepted. It's not working. See image.

 

Thanks in advance!