Serial Monitor ELEGOO UNO R3 Communication

Development Tools IDE 1.x
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Hi - I'm really new at all this. Purchased a Primary Starter kit (with Elegoo UNO R3) and going through the lessons. I'm on a MAC.
I have finished the Lesson of connecting a bunch of LED lights with the 74HC595 shift register - the next lesson wants me to connect and send info back to the UNO R3 board through the Serial Monitor. I am connected to the UN0 R3 and using the 8 LED with the 74HC595 ic sketch - all working. The UNO R3 receives the sketch - no problem, however when I open the Serial Monitor it does not display the message "Enter LED Number 0 to 9 or 'x" to clear" - the Serial Monitor opens - the L light on the board indicates this happening. The 'Tx' light does on flash. When I send 'x' Send on the top line the Rx' flashes however the LED lights do not change - to off.

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Also are you including LF and or CR anywhere ?

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Thanks - I checked the AnalogReadSerial sketch and this is the 'Serial.begin(9600)' - same as the Serial Monitor value. I have included an image of what the Serial Monitor display looks like when I open it from my working sketch. I would expect the Tx to flash when I start it - assuming the Tx means transmitting. The Lesson indicates that Arduino should send this message to the Serial Monitor -> 'Enter LED Number 0 to 9 or 'x' to clear'

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If the serial rate is correct try combinations of the CR & LF at the bottom left of the serial monitor.
Just in case its expecting something

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Does CR - stand for Connection Rate and LF stand for Line Feed?? If so I tried different values. Connection seems to work as the L light flashes when I start the Serial Monitor and the Rx flashes when I Send a number or x in the top line. The Tx doesn't flash - maybe it is not suppose too, but I would expect it to if Arduino was sending to the Serial Monitor.
Thanks

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CR = Carriage Return
LF = Line Feed

They are throwbacks to an earlier age but still required in many forms of serial communication.
If you are going to be using serial comms then its probably worth a little reading up on along with Stop Bits, Parity etc.

Its not too deep a subject if you dont want it to be but worth having a little grounding in.