Remember it is a reflection report, so you should not follow the IELTS essay format.
Write more than 250 words. Do not worry about grammar and usage of academic words. The main focus is your opinion about the blog. It is free writing.
You should describe the blog first and then write about giving and receiving feedback. Write as if you are explaining it to your friend. :
These questions may help you to write.
1. What are doing? (Description of the blog)
2. How are you doing?
3. Write about the process of giving feedback. (How is it helping you? What have you learned by commenting? What skills have you learned by giving feedback? How working on the blog is helping you in your life? How is it going to help you in your future career?)
4. What you do not like about the blog.
5. Your suggestions.
4. What you do not like about the blog.
5. Your suggestions.