If you want to have an open ended question added in your course for your students to fill out, here is one way to do this:

Choose Create Learning Activity on the page you want to add this:

Choose Quiz :

You can go through some of the options here or leave them as default. Click save and view on your page.

You'll need to go to your page and find where it has been added:

Note: you could title it the same as your question if you want.

Once you find it and click on the quiz you should see this:

Now click Edit Quiz, Add a new question with the drop down menu on the right side:

Now it asks you to choose a question type.

With an open ended question, what seems to be the best question type is "Essay"

You need to supply a question name and question text.

Question Text is what students will see.
Question name seems to be more for finding it in the question bank, especially if you have many similar or questions in different parts of your course.

Browser not supported