If you are having any trouble or just have a question, create a support ticket. You do NOT have to be a paying customer to open a ticket, though we prioritize customer requests.
If you're seriously considering using CoCalc to teach a course, but aren't sure of some of the details and really need to just talk to a person, fill out this form and request a live video chat with us. We love chatting (in English, German and Russian), and will hopefully be able to answer all of your questions.