You will have to reset your permissions on those files. Use sudo to change
the ownership to your username and set the read/write permissions as well.

you are going to have to tell me how to
use sudo to change the ownership. I am assuming it is done in the terminal
but I know absolutely nothing as to the codes to use.

Here is a page that will help explain file permissions:

https://help.ubuntu.com/community/FilePermissionshttps://help.ubuntu.com/commun\
ity/FilePermissions>

First you will have to go to a terminal session then type

sudo <your username> then press enter. You will be prompted for your
password. Once you do that then you can use the commands chown to change
the owner (you) and chmod to change how you can access the files
(read/write). The above link talks about these commands and shows examples
on how to use them.

I hope this helps. It may not make sense at first but once you do it a few
times you will get the hang of it.

you can also do sudo nautilus and it wil open nautilus as root. Left click on
file you want to chnge and select properties and permissions.

You can use the following:
press ALT+F2.On the RUN screen type the following gksudo nautilus
and then give the password of your system.Then access your files with the new
window you will be able to access those files.

Save the files on to a Read-Write DVD.

Files saved to a write-only CD or DVD are automatically designated as
locked'.

That should solve your problem.