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So, to set it up, it would be better to set it up on your local computer first. You will need to install Jekyll and use their template as a quickstart.
https://jekyllrb.com
says to fire up these commands in the terminal:
$ gem install bundler jekyll
$ jekyll new my-awesome-site
$ cd my-awesome-site
$ bundle exec jekyll serve
# => Now browse to http://localhost:4000
This should set up a basic template for your blog with a demo post.
Thanks.