Log in to Every https://www.every.education/Landing or via the deskop shortcut.

Log in to E-Learning

Click Users and then All Users:

Find the user and click View/Edit at the end of the row:
Click the 3 dots next to their name on the left and then Manage Enrolments:
Move the slider on the course to enroll, scroll down to the bottom to apply the changes:

You can tick multiple users from the list and manage enrollments from the top: