Most web pages in the course have a New Discussion Thread button at the bottom of the page. This opens up a window from which you can post comments for the entire class or private questions to the instructor and/or TAs of the course. These posts will appear in the course Forum and will also be listed at the bottom of the page from which you created the thread.

This is the preferred way for you to ask questions or comment on the course materials. You are strongly encouraged to use this rather than to simply fire up your email program and write directly to the instructor. If you have a question about an assignment, use the button at the bottom of the assignment page. If you have a question about some code appearing on a page of lecture notes, use the button at that bottom of the page containing that code, and so on. Email should only be used in situations where this clearly does not work (e.g., you are not registered for the course, you have not been able to create your login account, the course website is down or broken, etc.)