I have found a mistake in one of the language courses I’m currently taking, so I 'd like to report this to the creator of the course. How can I do this? I know the name of the course creator but don’t know how to send him/her a message.
In many cases there are as threads on the courses here in the forum where corrections and questions should be posted, check the section dedicated to the language you study.
In this case you simply can’t contact the course author. Consequently, you can only apply to become a contributor to the course and fix things yourself.
Read more about this here: