Use the following code in functions.php to create an options page

 

if( function_exists('acf_add_options_page') ) {

$option_page = acf_add_options_page(array(

'page_title' => 'Theme Settings',
'menu_title' => 'Theme Settings',
'menu_slug' => 'theme-general-settings',
'capability' => 'edit_posts',
'redirect' => false,
'parent_slug' => 'options-general.php'
));

}