Summary
Instructors have the ability to send a reminder to students or groups who haven't yet made a submission for an assessment. There is a "Send Reminder" option to items in the Gradebook. Reminders is an option for all gradebook items, including LTI and third-party tools. The item must be visible to students and have no release conditions.
Body

1. Navigate to the course Gradebook:

2. In list view, click the ellipsis to the right of the item:

In gradebook view, click the icon in the column header of the item:

3. Select “Send Reminder” from the dropdown menu:

4. Click “Send” in the popup window. At this point, Blackboard will automatically send a reminder to students who have not made a submission:

5. You should receive confirmation in a popup window once the reminder has been sent:
