I cannot find out how to make course colors appear on things I add for when assignments are due
When you add an event you need to select the "Calendar" which is the course you want associated with a that particular event. If you don't see the course you want listed on your "Calendar" then that means you have not selected that course to display content on the calendar.
When viewing your calendar look to the right hand side and under "CALENDARS" you should see all your courses listed. Any course with a color will display content on the calendar and those are the only courses you can add events to.
Have a great day.
Retrieving data ...