Once on CD-r , it's there. You can't change the files on a CD-r. You need to copy the file to your hard drive and work with it then.
I'm helping a friend do a second edition of a book of poetry they had published and the copy i'm editing is on a cd-r so i won't ruin the original. This is a copy of the first edition. Everytime I make changes to it it says "read only" and won't save it. I know zero about computers I'm a writer. I'm in the middle of a move and my computer is out of commission and I'm currently using the public library computer to work on it can you help me? I tried copying the material and pasting it into Word and altering it but it still won't and I tried saving it to a floppy from the cd-r but no luck 911! I have to finish this by Nov 1.