From the Application Management screen, the administrator has the capability to filter and sort applications by a variety of criteria. Once you have filtered your preferred group of applicants that you are ready to change their application status, you can select multiple applicants by checking the box to the left of the student's name or selecting the box in the header row to select all students in your view. 

Once students are selected if the administrator scrolls down to the bottom of the Application Management screen there will be options to set the selected applications to either eligible or ineligible. Once the admin clicks "Set" the selected applications will change to the specified status.