How do i see my completed students in DLCgo?

Click on either the Teacher Tab, Course Tab, or Section Tab
Click on either your name, the course name, or the section name based on the tab you chose in #1
In the Navigation Menu, click on the Enrollment History link in the Historic Data pane
At the top of this page, you can play with the filters to get the data you need. But the left-hand filter controls the date range, and the right-hand filter controls the status you are looking for. By default, it shows all students who are not active (completed, dropped, etc). So, to see all completed students, choose COMPLETED from the right-hand drop-down.