Go to Assignment Manager. Select an existing assignment. Click “Edit Assignment.” You’ll see the assignee list and a big “Add Users” button.
When you click “Add Users” a list of learners available to add will appear. Select your add(s) and click done. The new users will appear in the assignee list.
Note: This function adds users to the existing assignment specs (i.e. added users will be assigned the same content, same effective and due dates, same passing score, etc).