For now, in the submission box, type in 10 words or greater that you understand that there will be an oral midterm exam for the course, and that you will prepare topics to present to me at the end of the course.   don't submit any topics yet, as this will take place just before the end of the course, and the purpose of this box is just to warn you ahead of time of the requirement.

This is simply a warning and just wants you to understand that you will be having an oral exam on different topics at the end of this english course. All you have to do is type in a few words about how you understand and have heeded and seen the warning.

Something like this should be sufficient: I understand that there will be an Oral Midterm Exam at the end of this course, and I will be thinking about different topics in the meantime.