WordPress has built in support for SEO 友好的 URL 结构. All you need to do is to open 设置 » 固定链接 page in the 管理区 and choose a URL structure for your site. There are a number of options available. We recommend choosing a URL structure that shows your post title in the URL because it is SEO friendly and will help others discover your site in search engines. Once you have setup 永久链接 you need to save your changes.
This is when you need to look in the Trash folder. When you trash a WordPress post or page, it is not entirely deleted. It sits in the 垃圾 for 30 days before it gets permanently deleted. This is done to give you an option to restore trashed item if you accidentally deleted them.