// Auto login after registered
function automatically_log_me_in( $user_id ) {
    wp_set_current_user( $user_id );
    wp_set_auth_cookie( $user_id );
    wp_redirect( home_url( '/' ) );
    exit(); 
}
add_action('peepso_register_new_user', 'automatically_log_me_in', 999 );