At the bottom of all of the messages for an assignment question, click Reply.
If your student sent more than one message for a single assignment question, your reply is associated not with a specific message, but with the conversation about the assignment question.
Type your message in the Reply box.
You can use Quick Notes in your message.
Click Send.
Your message is sent and the conversation status is changed to answered.
If needed, you can add another reply to the conversation or report a question error.