on 02-16-2019 03:11 AM
I am not sure what you mean by "header" - the title or name of the assignment? If that is the case, you can just click on the assignment you want to change the name for ("Assignments" tab), then Edit Assignment -> Edit Assignment Information. This opens a page where you can change the name.
Hope this helps. If you mean something else by the header, please let me know, and I will try to help. I also use CNOW for my courses.
on 02-16-2019 07:45 AM
@sinjini_mitra has already indicated how it's done, but this document is a great reference as well if you need more information: