You must not have write permission for that folder. If you do a 'ls -alh' on a directory you will see the following:
-rw-r--r-- 1 g00se root 20k Sep 22 11:29 viewjobs.cfm
The first character has to do whether the file is a directory. In this case it is not.
The 'rw-' is the owner permissions, so the owner g00se has read/write access to this file.
The 'r--' is the group permissions, so anyone in group root may read this file.
The second 'r--' is everybody else, everyone else may read this file.
You use the 'chmod' command to change permissions. You may also use the 'chown' command to change owners. The 'chgrp' command will change groups.
There are a couple of ways to chmod with different syntaxes. The one I prefer is as follows:
4 - Read
2 - Write
1 - Execute
So to make the above file group writable I would do:
chmod 664 viewjobs.cfm
Check
http://www.oreillynet.com/linux/cmd/ or the man pages (i.e. type 'man chmod' from a shell prompt) for information on these commands.