Header banner can't be configured...

[drumandstage]

Header banner is listed on the Customize page under Extensions Manager, but there is no link on the General page under Board Configuration.

I couldn't upload the Headerbanner folder directly in the file mananger, so I created a new folder with the same name and uploaded all the files from the folder on my desktop into the newly created folder but they aren't folders, they are purple page icons with a turned down upper right corner.

[Administrator]

I couldn't upload the Headerbanner folder directly in the file mananger

Your cPanels file manager is never the best way to upload files and directories. You are far better off using a proper FTP program such as https://winscp.net/ which is the one I use