To assign a course to an individual, first find the course in the Author section of SafetyNow. You can search for the course, or browse through the entire list.
Once you've found the course, click on the title of the course to be brought to this screen:
Click on Learners and you will be presented with a list of everyone already enrolled in the course. To enroll a new person, click on + Learner in the upper right, and type their name into the box that appears. Once you find the person you are looking for, click on their name in the dropdown.
If you have notifications on, that person will receive an email notifying them of the assignment. In any case, they can now log in to take their course.