Corection for plugin folder name

at the script you should use:

public static function script()
	{
		wp_enqueue_style('mybblastinfo-css', get_option('siteurl').'/wp-content/plugins/mybb-last-information/core/mybblastinfo.css' );
		wp_enqueue_script('jquery');
		wp_enqueue_script('mybblastinfo-js', get_option('siteurl').'/wp-content/plugins/mybb-last-information/core/mybblastinfo.js' );
	}

mybb-last-information NOT mybblastinformation.

https://ww.wp.xz.cn/plugins/mybb-last-information/