Hi @GEORGEGOGGANS, have you tired switching the "Participation" option on the Settings page from "Term" to "Course"? That should allow you to reset the start and end dates for the course, then save your changes. But you should return the dates to their original settings after you have saved your new content.
Another option is to copy the course content to a new Canvas shell, so that you can edit the content. Your Admin should be able to set up a new shell for you; if the shell for the next term is not yet available, they may be able to create a master shell, a blueprint shell, or even a sandbox for you.