I am trying to control a continuous servo (MG996R) with an RF remote but it's not working

Question

I am trying to control a continuous servo (MG996R) with an RF remote, but it's not working; the servo just spins in one direction.

I am new to Arduino so I don't really know if the code is correct.

This is my code:

#include <Servo.h>

Servo servothumb;         
Servo servoindex;         
Servo servomiddle;
Servo servoring;
Servo servopinky;

void setup() {
  pinMode(2,INPUT);
  pinMode(3,INPUT);
  pinMode(4,INPUT);
  pinMode(5,INPUT);
  Serial.begin(9600); // setting baud rate
  Serial.println(" Data 4 Ch Remote Control"); 
  servothumb.attach(9); 
  servoindex.attach(10); 
  servopinky.attach(11);
  servoring.attach(12);
  servomiddle.attach(13);
}

void loop() {
  if (digitalRead(2) == HIGH) { // Button B pressed
    Serial.println("B");
    servothumb.write(90); 
    servoindex.write(90); 
    servopinky.write(90);
    servoring.write(90);
    servomiddle.write(90);
  } else {
    servothumb.write(90); 
    servoindex.write(90); 
    servopinky.write(90);
    servoring.write(90);
    servomiddle.write(90);
  }

  if (digitalRead(3) == HIGH) { // Button D pressed
    Serial.println("D");
  }
  if (digitalRead(4) == HIGH) { // Button A pressed
    Serial.println("A");
    servothumb.write(0); 
    servoindex.write(0); 
    servopinky.write(0);
    servoring.write(0);
    servomiddle.write(0);
  } else {
    servothumb.write(90); 
    servoindex.write(90); 
    servopinky.write(90);
    servoring.write(90);
    servomiddle.write(90);
  }
  if (digitalRead(5)== HIGH) { // Button C pressed
    Serial.println("C");
    servothumb.write(180); 
    servoindex.write(180); 
    servopinky.write(180);
    servoring.write(180);
    servomiddle.write(180);
  } else {
    servothumb.write(90); 
    servoindex.write(90); 
    servopinky.write(90);
    servoring.write(90);
    servomiddle.write(90);
  }
}