First, you must find your tutor through the "Participants" link in the "People" block, available on the course homepage. You can filter the list by groups, or display only the tutors. Once you click on the name of your tutor, you will open his/her profile and you'll see a link to "Message". It is preferable to communicate with tutors via this internal messaging system of the Virtual Classroom. In urgent cases you can also use email.