Here is how to create a new post, using just the github interface.

• Login into your github account, select your github.io repository.
• Go to the _posts directory, and click on ‘Create File’
• Fill in the filename in the format ‘YYYY-MM-DD-postname.md’
• Fill in the frontmatter aka metadata, starting and ending with three dashes, like this.

In order to use tags, ensure that you specify ‘tags’ in the front-matter of the post.

---
layout: post
title:  "How to activate tags"
date:   2017-08-08
comments: yes
categories: general
tags: [jekyll,tags,pagination]
---

Now, in order to activate the tag(s), you’ll have to create tag page(s). For example, to activate a tag called ‘jekyll’, in the tag directory, simply copy template.md to jekyll.md, and within jekyll.md, change the value of the title variable, from ‘template’ to ‘jekyll’.