commands to delete options files

I dont think you can delete them with iSite.  The gui is no capable.  You would have to either delete it from command line (delete the file named: falcon.opt in the etc/idirect/falcon directory) or use WINScp to remove it (in the same directory).  You need to have another one readily available to put into it.  Do no leave it empty as it is what IDs your eth0 interface props.