When the teacher logs into V4S Roster, s/he sees the Class (es) that s/he is assigned to teach for the current day. Once s/he logs in to that Job / Shift, the teacher sees a Roster button on his/her mobile.
Clicking on the Roster button brings up a list of all the students / members who are supposed to attend the class. The teacher marks attendance by clicking the green Start button next to each student's name. This action creates a Member Hours record inside Salesforce for the specific Course/Class. At the end of the class (or when a student leaves the class), the teacher clicks on the End button next to the Student's name. This will stop recording attendance time for that student.