How to activate the child theme in Wordpress?

All the information you need can be found here: https://codex.wordpress.org/Child_Themes

The important parts to get it up and running would be to:

Make sure the parent theme exists (the complete accesspress-lite theme in your case)

Create a unique folder name for your child theme.

Create a style.css file in your child theme folder.

/*
Theme Name:   Your Child Theme Name
Theme URI:    http://access-keys.com/accesspresslite/
Description:  Accesspress Lite Child Theme
Author:       Your Name
Author URI:   http://www.your-child-theme.com
Template:     accesspress-lite
Version:      1.0
Tags:         blue, white, light, custom-menu, one-column, two-columns, three-columns,   left-sidebar, right-sidebar, fixed-layout, fluid-layout, custom-background, featured-image-header, sticky-post, theme-options, threaded-comments, featured-images, full-width-template, custom-header, flexible-header, responsive-layout
Text Domain:  accesspress-lite-child
*/

Make sure the Template line matches the parent them folder.

Create a functions.php file within the child theme folder. In that file, import your parent theme styles. Doing this instead of an @import in your stylesheet makes sure that the dependencies are met.

function child_theme_enqueue_styles() {
    wp_enqueue_style( 'parent-styles', get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-styles',
        get_stylesheet_directory_uri() . '/style.css',
        array( 'parent-styles' )
    );
}
add_action( 'wp_enqueue_scripts', 'child_theme_enqueue_styles' );

Note that as a child theme, any time you use get_template_directory_uri() you’re grabbing the parent theme directory. Using get_stylesheet_directory_uri() will give you the child theme directory.

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