You can enrol learner for a course by clicking on +Course. When the pop-up appears you can select several courses and click on Update. You can also give access to groups if these are already made. To do this click on +Group. Adding a learner to a group is done the same way as enrolling a learner. The learner will then automatically be subscribed to the courses that are linked to the group. Here you can also extend the courses for the learners, please read more about this here.