How did I create blog on github?

1. Step 1

   https://pages.github.com

2. Step 2

   https://help.github.com/articles/adding-or-removing-a-custom-domain-for-your-github-pages-site/

3. Step 3

   https://help.github.com/articles/quick-start-setting-up-a-custom-domain/

4. Step 4

   https://help.github.com/articles/setting-up-a-custom-subdomain/