A quick way to get in touch with us while you are in the middle of a course is to click the Help button in the lower left of the page (on the course/exam site), where you can search for an answer to your question and leave us a message if you do not find one -- we receive and do respond to those!
The help button looks just like this:
If you'd like to send us a message right now, just click the "Submit a request" link in the top right corner of this page.
Our staff hours are from 8:30 to 5:00 Monday through Thursday and 8:30 to 4:00 Friday. We try hard to respond to messages within one business day, and preferable even sooner.
You can also reach us through social media and our discussion forums; see our community page for all the details.