You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run jekyll serve, which launches a web server and auto-regenerates your site when a file is updated.

Jekyll requires blog post files to be named according to the following format:

YEAR-MONTH-DAY-title.MARKUP

Where YEAR is a four-digit number, MONTH and DAY are both two-digit numbers, and MARKUP is the file extension representing the format used in the file. After that, include the necessary front matter. Take a look at the source for this post to get an idea about how it works.

Jekyll also offers powerful support for code snippets:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace TestApp
{
    class Program
    {
        private readonly bool _isTrue = true;
        public static string Message { get; set; }

        static void Main(string[] args)
        {
            var obj = new DomainObject
            {
                IsActive = false,
                Users = new List<int> { 6, -2, 5, 1 }
            };
            Message = $"Message of the day: {Message}";
            Console.WriteLine(Message);
        }
    }

    class DomainObject
    {
        public bool IsActive { get; set; }
        public IList<int> Users { get; set; }
    }
}

Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll Talk.