How can I change read/write permissions for a DVD RW?

I've some files saved onto a DVD RW previously and would like to add on more files to it.  However, it doesn't allow me to do that.  When I checked the file info, it says that I have read & write privilege, but at the same time, there's another line that says "You can only read".  When I clicked on the lock to attempt to make changes to settings, nothing is clickable.  Take a look at the screenshot below and you'll know what I mean.
Can anyone advise on why this is happening?

A DVD-RW has to be wiped before re-use, so you will lose all data previously copied to it.

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