If you want them to be loaded on boot you need:

# mv /opt/etc/init.d/K01system /opt/etc/init.d/S01system
# ipkg install nano
(maybe already installed)
# nano /opt/etc/init.d/S01system
and add like in this example:

#!/bin/sh

mod_serial=/opt/lib/modules/2.6.21/kernel/drivers/usb/serial/usbserial.ko
mod_ftdi=/opt/lib/modules/2.6.21/kernel/drivers/usb/serial/ftdi_sio.ko

func_start()
{
echo "Start system tweak"
# insert your custom code below
insmod ${mod_serial}
insmod ${mod_ftdi}
}

func_stop()
{
echo "Stop system tweak"
# insert your custom code below
rmmod ${mod_ftdi}
rmmod ${mod_serial}
}

case "$1" in
start)
func_start
;;
stop)
func_stop
;;
restart)
func_stop
func_start
;;
*)
echo "Usage: $0 {start|stop|restart}"
exit 1
;;
esac

func_start() och func_stop() delen förtår jag inte.# insert your custom code below delen vad menar dem med den.
bytte ut min opt/etc/init.d/K01system /opt/etc/init.d/S01system texten mot ovan.