arduino 004 and send serial message

Hello. i'm running Arduino 004 on Mac OS 10.3.9. I can't install 005 (because i dont have 10.4)

And now i wanted to use the send_serial_basic script, to send a letter (H) to get my LED to blink, but i don't know how to send the letter (I don't have that nice little send input box & button in my serial monitor

how to do it? help would be very appreciated

Try Arduino 0006: http://www.arduino.cc/en/Main/Software

It should run on Mac OS X 10.3.9 and has a text field in the serial monitor for sending data to the board.