Apologies if this a relatively simple question, but I am rather new to Arduino's and cannot seem to find any concise information on the topic.
This is my XBee, mounted on a shield and placed onto a MEGA 2560. I want to leave Serial for USB debugging and use the Serial1 for XBee communication. [![enter image description here][1]][1]

Just to confirm, the two XBee's do communicate if I use SoftwareSerial. This is the code that works using SoftwareSerial:

#include <SoftwareSerial.h>

// XBee's DOUT (TX) is connected to pin 10 (Arduino's Software RX)
// XBee's DIN (RX) is connected to pin 11 (Arduino's Software TX)
SoftwareSerial serial1(10, 11); // RX, TX
boolean nextLine = false;
void setup() 
{
  Serial.begin(9600);
  serial1.begin(9600);
}
 
void loop() 
{
   while(serial1.available()){ // there is data being sent from the xBee
    char read = char(serial1.read());
    if(read == 'A'){
      //Where ~ is the EOT character
      serial1.write("55.134~");
    }
  }
}

How do I communicate using Serial1? [1]: https://i.sstatic.net/UyKUE.jpg

Apologies if this a relatively simple question, but I am rather new to Arduino's and cannot seem to find any concise information on the topic.
This is my XBee, mounted on a shield and placed onto a MEGA 2560. I want to leave Serial for USB debugging and use the Serial1 for XBee communication.

Just to confirm, the two XBee's do communicate if I use SoftwareSerial. This is the code that works using SoftwareSerial:

#include <SoftwareSerial.h>

// XBee's DOUT (TX) is connected to pin 10 (Arduino's Software RX)
// XBee's DIN (RX) is connected to pin 11 (Arduino's Software TX)
SoftwareSerial serial1(10, 11); // RX, TX
boolean nextLine = false;
void setup() 
{
  Serial.begin(9600);
  serial1.begin(9600);
}
 
void loop() 
{
   while(serial1.available()){ // there is data being sent from the xBee
    char read = char(serial1.read());
    if(read == 'A'){
      //Where ~ is the EOT character
      serial1.write("55.134~");
    }
  }
}

How do I communicate using Serial1?