Fields marked as 'static'

Hey! I'm going through a Udemy course on C# and something has stumped me and I can't work it out...

The video is covering fields within classes, which I understand fine. However, in the video, they have a 'int myResult' variable which isn't marked as static. The variable is being used in various methods without the compiler complaining. However, when I've recreated it, my variable needs to be marked as static.

Here's my code

namespace FieldsAndInstanceVariables
{
  internal class Program
  {
    // As the variable is declared in the class and not a method, it's a 'field'
    // This can be used throughout the class
    static int myResult;

    static void Main(string[] args)
    {
      myResult= Add(5, 5);
      Console.WriteLine($"5 + 5 = {myResult}");

      myResult= Subtract(5, 5);
      Console.WriteLine($"5 - 5 = {myResult}");
    }

    static int Add(int a, int b)
    {
      return a + b;
    }

    static int Subtract(int a, int b)
    {
      return a - b;
    }

  }
}

namespace FieldsAndInstanceVariables
{
  internal class Program
  {
    // As the variable is declared in the class and not a method, it's a 'field'
    // This can be used throughout the class
    static int myResult;

    static void Main(string[] args)
    {
      myResult= Add(5, 5);
      Console.WriteLine($"5 + 5 = {myResult}");

      myResult= Subtract(5, 5);
      Console.WriteLine($"5 - 5 = {myResult}");
    }

    static int Add(int a, int b)
    {
      return a + b;
    }

    static int Subtract(int a, int b)
    {
      return a - b;
    }

  }
}

In the video, the code is pretty much the same. With the exception of 'myResult' not being marked as static. They are not calling an instance of the class or anything, and it's confusing me. Unless they have errors turned off or something...?

namespace FieldsAndInstanceVariables
{
  internal class Program
  {
    // As the variable is declared in the class and not a method, it's a 'field'
    // This can be used throughout the class
    static int myResult;

    static void Main(string[] args)
    {
      myResult= Add(5, 5);
      Console.WriteLine($"5 + 5 = {myResult}");

      myResult= Subtract(5, 5);
      Console.WriteLine($"5 - 5 = {myResult}");
    }

    static int Add(int a, int b)
    {
      return a + b;
    }

    static int Subtract(int a, int b)
    {
      return a - b;
    }

  }
}

namespace FieldsAndInstanceVariables
{
  internal class Program
  {
    // As the variable is declared in the class and not a method, it's a 'field'
    // This can be used throughout the class
    static int myResult;

    static void Main(string[] args)
    {
      myResult= Add(5, 5);
      Console.WriteLine($"5 + 5 = {myResult}");

      myResult= Subtract(5, 5);
      Console.WriteLine($"5 - 5 = {myResult}");
    }

    static int Add(int a, int b)
    {
      return a + b;
    }

    static int Subtract(int a, int b)
    {
      return a - b;
    }

  }
}

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