I am working with a site I did not set up and needed to install a backup plugin. When I went to do so, I received the message that the installation had failed because the directory could not be created. I FTP'd to the site and tried creating the directory manually and discovered that all WordPress folders (wp-content, wp-admin, wp-includes) are write protected. I cannot CHMOD these folders via FTP or the servers cPanel. I am at a loss as to how to make these files writeable again.
My user account is an administrator with full priviliges in WordPress and on the server. Any suggestions as to what might be causing this and how to address the issue?