To access your student roster in myLesley, go to your course Control Panel, click Users and Groups, and select Users.
This will display a list of all of the people enrolled in your course, including students and TAs.
You may also use the Performance Dashboard to see user activity in your course, including when people have logged into your course and how many times they have posted in the Discussion Board. It also provides a direct link to the Grade Center to check student grades. More information may be found here: Performance Dashboard.
If your myLesley student list/roster is blank, it may be due to the fact that the course start date is greater than 8 weeks in the future. Students are added to the course site 8 weeks prior to the start date of the course.