Thank you for the opportunity to help you with your question!
A response essay requires you to read something or watch a video and respond to it. Its very simple; lets say you just read an article on how aggressive pitbull dogs can be, the article makes a few accusations that you do not agree with and you respond to the article to say "The article was very entertaining and although I did not agree with all parts discussed, the article was very thorough..." and then you continue rsponding to the article with the parts you enjoyed, the parts that you learned from, the parts you agreed with or did not agree with, and so on.
Please let me know if you need any clarification. I'm always happy to answer your questions.