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1. Use a macro like this to send AT commands:

    #include <SoftwareSerial.h>
   
    SoftwareSerial btSerial(2, 3); // RX, TX
    /*
     * Connect pin 2 Arduino to pin TX HC-06 
     * Connect pin 3 Arduino to pin RX HC-06
     */
    void setup() {
   
    Serial.begin(9600);
   
    Serial.println("Enter AT commands:");
   
    btSerial.begin(9600);
   
    }
   
    void loop()
   
    {
   
    if (btSerial.available())
   
    Serial.write(btSerial.read());
   
    if (Serial.available())
   
    btSerial.write(Serial.read());
    delay(1000);
    //btSerial.print("AT+PIN4321");
    //btSerial.print("AT+NAMEAlibaba");
    //btSerial.print("AT+BAUD4");
   
   
    }
   

2. You may have another port set on the HC 06 instead of 9600, like I had. If so, try this code with all the possible port numbers and changing something like the password, and everytime you run the code - go check if it worked, this way you will find in wich port number you have your module.

good luck