Attendance can be tracked manually in Blackboard using the Attendance tool or automatically using a Student Response System.
Another popular option would be to use a Student Response System such as iClicker or Acadly's attendance tool.
Original Course View:
Some instructors take attendance by creating a column in the Grade Center and manually entering the attendance data.
Ultra Course View:
The Ultra course view allows instructors to manually record attendance. Instructors can access the attendance page by clicking Attendance on the Course Content page.