changes, but could not, bottom notation with Libra symbol said “read only” . How do I change this restriction so it will allow me to make updates . Thank you
This is probably not LibreOffice specific, but how any operating system treats DVD-RWs. Updating single files on a DVD-RW is harder than updating, adding or deleting some data on a harddisk or flash drive, because moving a little bit of data around on a small part of the rewriteable disc is far less precise than doing the same on a harddisk.
To edit content that is stored on a DVD-RW, copy the content of the disc to your hard drive, edit the copy on the hard drive and write the whole directory back to the disc (by replacing the existing content).