Help with modifying an existing sketch

Hi all

I need help with adding additional functionality to my code,

I am using blynk with an esp8266 nodemcu to control a servo.

I would like to add a relay in to the mix, so i need to energise the field coil of the relay before the servo portion of the sketch runs, then de-energise the field coil after.

Basically, im powering my servo externally, and instead of having power to it all the time, i want to use a relay to cut the power in before servo runs, then cut the power until i press my button in blynk again.

Ive tried a bunch of different ways but none of them seem to work,

The code im using can be seen below.

Any help would be greatly appreciated

Kind regards.

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <Servo.h>

Servo servo;

char auth[] = "your auth token";
char ssid[] = "your wifi name";
char pass[] = "your wifi password";

void setup()
  Blynk.begin(auth, ssid, pass);

  servo.attach(15); // NodeMCU D8 pin
void loop()

Before you do anything, you need to fix this.