By default, Post Promoter Pro requires the administrator role in order to edit it’s settings. You can alter this by using the ppp_manage_role filter. Here’s how you can set the editor role to have access to the general Post Promoter Pro settings:

ck_ppp_change_manage_role( $role ) {
    return 'editor';
}
add_filter( 'ppp_manage_role', 'ck_ppp_change_manage_role', 10, 1 );