You can invite people to your individual courses in a number of ways. Course invites can be accessed from different areas including: the participants tab of your course builder; the course marketing page; and on course hotlinks - hotlinks can be accessed by hovering over any course you are editing, either on the homepage or courses section of the site. You can also invite course editors to your course. This can be found on the upper right hand corner of the course you are editing in the builder (it's a plus sign).
In order to remove an editor from a course, simply hover over the round image of that person in the list editors for the course (upper right hand corner) and click the 'x'. You will be asked to confirm deleting this editor, to ensure this is what you want to do. You can always add back a course editor later if so desired. See the various invites in the screenshots below.
INVITE BY EMAIL (PREFERRED OPTION)
COURSE MARKETING PAGE
VIDEO TUTORIAL - SOCIAL SHARE
COURSE INVITE HOTLINK
INVITE COURSE EDITORS/ADMINS & INSTRUCTORS
DELETE COURSE EDITOR