Issue with add_meta_box function on Divi theme

I have the basic function added to my child them to make this show up in my edit page but need a little help finalizing it.

Here is a 2 min video I made for you

Here’s the code being used:

add_action( 'add_meta_boxes', 'ampforwp_title_custom_meta_for_divi_category_builder' );
function ampforwp_title_custom_meta_for_divi_category_builder(){
add_meta_box( 'ampforwp_title_meta', __( 'Show AMP for Current Page?' ,'accelerated-mobile-pages'), 'ampforwp_title_callback','et_extra_options','side' );