You can edit students one at a time using the edit student page mentioned above.  However, Connect allows you to delete multiple students at one time.
If you need to delete multiple students at one time:

• Click the delete students link above the roster table.
• A delete students roster table appears.
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• Select the students you want to delete by checking the box next to their name. To delete all students click select all located just above the student column.
• A note at the bottom reminds you that deleting students prevents them from accessing this section's assignments, reports, and eBook (if applicable). Export any report information you want to save before deleting students. Caution: You can't undo this!
• If you are ready to delete students, click the delete button to continue.
• You will see a confirmation page with the selected students displayed.
• Click delete selected students to continue. Note: Deleted students and their grade data are not recoverable.
  
  After confirming that you want to delete the students, you will be returned to the roster page with the deleted students removed from the roster list.