If you wanted to change permissions you could use "chmod" in the terminal.

If you want to forcibly delete the file, navigate to the directory (folder) containing the file (using the "cd" command) and then use "rm" to remove it.

I suggest looking them up but if you tell me the name of the photo or file I will write out exactly what you need to do so you can copy/paste.

Cheers,

Abe

By the way, you will likely need to install the "gainroot" app and then, before using the commands I listed above, type "sudo gainroot".

Hope this helps.