Use Blackboard’s Announcements feature when you need to communicate with your class as a group. You can push the announcement to students’ emails, and a copy of the announcement will also appear on your course site. Set your course homepage to Announcements to make it easy for students to find.
Alternatively, you can access the student roster found on the faculty resources page of mycharger to send an email; however, students will not have a single point of reference as they do in Blackboard Announcements.