Some questions about this forum

When I search a TOEFL essay topic, I find this forum. There are so many corrected essays on there and teachers` instructions are very helpful. But I still have some questions about these.

  1. All of instructions are free?
  2. Is there any requirement for applying a correcting?
  3. Is there any limit on the number of my posting essay?


TOEFL listening discussions: Where does this conversation most likely take place?

Thanks for your answers, Luschen.