i am using the theme education mind for creation of my own Homepage.

Their is only one Header Image, that i cant replace over slider or different Images on each side.

In the functions.php i found this related lines:

$min = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
                add_theme_support( 'custom-header', apply_filters( 'education_mind_custom_header_args', array(
                        'default-image' => get_template_directory_uri() . '/images/custom-header.jpg',
                        'width'         => 1920,
                        'height'        => 490,
                        'flex-height'   => true,
                        'header-text'   => false,
                ) ) );
                // Register default custom headers.
                register_default_headers( array(
                        'main-banner' => array(
                                'url'           => '%s/images/custom-header.jpg',
                                'thumbnail_url' => '%s/images/custom-header.jpg',
                                'description'   => esc_html_x( 'Main Banner', 'custom header image description', 'education-mind' ),
                        ),
                ) );

But my first Trails for Change it to wished failed.

From SliderPlugIn i got this line for include it in the theme, but my Trails to include it to failed.