This sample code is for Control Multiple Servo Using Blynk App's tutorial.

Multiple_Servo_Blynk.ino

/*************************************************************
  Control multiple servo using a Blynk App!
  App project setup:
 *************************************************************/

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial


#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
#include <Servo.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";

// Hardware Serial on Mega, Leonardo, Micro...
//#define EspSerial Serial1

// or Software Serial on Uno, Nano...
#include <SoftwareSerial.h>
SoftwareSerial EspSerial(2, 3); // RX, TX

// Your ESP8266 baud rate:
#define ESP8266_BAUD 9600

ESP8266 wifi(&EspSerial);

Servo servo1;
Servo servo2;
Servo servo3;
boolean state1 = false;
boolean state2 = false;
boolean state3 = false;

BLYNK_WRITE(V1)
{
  if (state1 == false) {
    state1 = true;
    servo1.write(0);
  }
  else {
    state1 = false;
    servo1.write(90);
  }
}
BLYNK_WRITE(V2)
{
  if (state2 == false) {
    state2 = true;
    servo2.write(0);
  }
  else {
    state2 = false;
    servo2.write(90);
  }
}
BLYNK_WRITE(V3)
{
  if (state3 == false) {
    state3 = true;
    servo3.write(0);
  }
  else {
    state3 = false;
    servo3.write(180);
  }
}

void setup()
{
  // Debug console
  Serial.begin(9600);

  // Set ESP8266 baud rate
  EspSerial.begin(ESP8266_BAUD);
  delay(10);

  Blynk.begin(auth, wifi, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, wifi, ssid, pass, "blynk-cloud.com", 80);
  //Blynk.begin(auth, wifi, ssid, pass, IPAddress(192,168,1,100), 8080);

  servo1.attach(11);
  servo2.attach(10);
  servo3.attach(9);
}

void loop()
{
  Blynk.run();
}