How do I enroll an existing user account into my class?

From the Blackboard "My Institution" area:

Click on the course you are teaching as listed under the "My Courses" menu.
Once inside the course's Bb area, click on the gray "Control Panel" button on the left-hand menu.
Under "User Management", click on "Add Users".
The first option on the "Add Users" page will be "Enroll Existing User". Click on the "Enroll Existing User" link.
From the next page you will be able to search all Bb user accounts by last name or username.
Enter your search criteria (text) and click on the gray "Search" button.
From the results that are displayed, you can enter a check in the left-hand checkbox to select a user or users to enroll.
Once you have made you enrollment selection(s), click on the gray "Submit" button at the bottom of the page to enroll the user(s) into the Bb course.
After you have submitted, you should receive a confirmation page that states whether your submission to enroll was successful.
Click the gray "Ok" button on the right to return to the course's control panel.