Editing a WordPress Theme

This is a method for editing WordPress themes by modifying backup files (referred to as child themes) without touching the original.

1. To easily identify the child theme in use, create a new folder in the “wp-content/themes” directory by combining the theme names. (For example, if the original theme is “twentyfifteen”, create a folder named “twentyfifteen-child”)
2. Copy the original theme’s “style.css” into the child theme folder and modify the “Theme Name” and “Template” as follows:

   /*
   Theme Name: Twenty Fifteen Child
   Theme URI: https://wordpress.org/themes/twentyfifteen/
   Template: twentyfifteen
   Author: the WordPress team
   Author URI: https://wordpress.org/
   Description: Our 2015 default theme is clean, blog-focused, and designed for clarity. Twenty Fifteen's simple, straightforward typography is readable on a wide variety of screen sizes, and suitable for multiple languages. We designed it using a mobile-first approach, meaning your content takes center-stage, regardless of whether your visitors arrive by smartphone, tablet, laptop, or desktop computer.
   Version: 1.5
   License: GNU General Public License v2 or later
   License URI: http://www.gnu.org/licenses/gpl-2.0.html
   Tags: black, blue, gray, pink, purple, white, yellow, dark, light, two-columns, left-sidebar, fixed-layout, responsive-layout, accessibility-ready, custom-background, custom-colors, custom-header, custom-menu, editor-style, featured-images, microformats, post-formats, rtl-language-support, sticky-post, threaded-comments, translation-ready
   Text Domain: twentyfifteenTemplate: twntyfifteen
   This theme, like WordPress, is licensed under the GPL.
   Use it to make something cool, have fun, and share what you've learned with others.
   */
   

3. Create a “functions.php” file in the child theme folder using the code below.

   <?php
   add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
   function theme_enqueue_styles() {
   wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
   }
   ?>
   

4. Copy the original theme’s “screenshot.png” into the child theme folder.
5. After copying the files from the original theme to the child theme folder, you can modify and use them as needed.

(Note: http://codex.wordpress.org/Child_Themes)