How to send Gcode to ATtiny13A

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I apologize for that. I got distracted by other things. (sick dog) I've since learned the the device is an ATtiny.

My knowledge of coding limited, but I've found a sketch that looks like what I need. The last line is Serial.println. But I can't get it to compile.

#include <SoftwareSerial.h>

#define RX 3 // *** D3, Pin 2
#define TX 4 // *** D4, Pin 3

SoftwareSerial Serial(RX, TX);

void setup()
{
Serial.begin(9600);
Serial.println("Initializing...");
}

I get an error at SoftwareSerial Serial(RX, TX); about a conflicting declaration.
I'v epoke around and can't find the solution. Can you help me with that?

Thanks,
Chris