How do I click "like" for a post to show the teacher that I read the message.

How do I click "like" for a post to show the teacher that I read the message.
Hello Hannah,
If the post is in the form of a discussion or update, there should be a Like option at the bottom of the post. In private messages, unfortunately there isn't a Like option. We recommend replying to the message.
Please let us know if there are any questions.