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.
This is a companion discussion topic for the original entry at https://friends.funkypenguin.co.nz/welcome-to-jekyll/