TAG Questions

I am tagging to UCSB, at the end it says something along the lines of “would you like to tell us anything else about this application?”
I know that as long as I keep my end of the agreement I will be admitted, but I did fail (and retake) a few classes. Should I mention that I know it doesn’t look good, I know I didn’t do well, but after two years I found a rhythm, a passion for learning, I realized I wanted to go to college, etc. or should I not even mention it.
Basically will it help or hurt or do anything in general to write that? or to leave it blank?
Thanks!