I try to uncheck read only on it, but it won’t let me. Any help on this is appreciated. Thanks.
Thats is probably because the files on a CD are read-only and can’t be changed. You would have to copy the contents of the CD to your hard drive, change the file and then burn the contents back onto a CD.
Or you can edit an image of the CD with an hex-editor (only working method if the CD is protected). But then you’ll loose the error correction of the modified sector and you’ll have to use an app like ECCRegen fo fix it.