We're upgrading the contact form, so please email the professor directly to his university email account. This information is provided at your course's website, or you can look it up in the faculty directory at your uni. Please be aware, however, that only the brief "Q and A" type issues are handled via email - for anything more, you will be instructed to book an appointment.
As always, students may not contact the professor via the LMS (its mail or comment systems).