You need to follow 2 steps to add authors in that theme. Here following the steps :
Step 1 (Add author in post) : #
In the post configuration area you need to put
author_id: 3
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For example :
---
layout: post
title: "Test Post title"
date: 2019-08-01 10:59:37 +0600
post_image: /assets/images/blog-images/blog-img16.jpg
tags: [tag1, tag2, tag2]
categories: [category-name]
author_id: 3
comments: false
excerpt: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magnaliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
---
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there author name is Jhon Doe but i have to put 3 or 4 or 5 or any other number.
Step 2 (Add author in _author data folder) : #
After adding the author_id in post you must need to create a html file with following configuration.
---
layout: author
name: Jhon Doe
author_id: 3
email: example@yourdomain.com
bio: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt .
image: /assets//images/authors/author-pic.jpg
location: Sao Paulo, BR
---
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You can add more option there like, facebook, twitter, instagram, instagram, reddit with the social links. It will display in author information area. These are actually optional.
Now copy that html folder inside _authors data folder
If you have already created html file for that author then you may skip the step #2
