第一项为显示的名称
第二项为链接地址
第三默认是全部用户，如果写上“Administrator ” 该连接只有登陆的用户为Administrator 才会看到

用户类型：
Super Admin – somebody with access to the site network administration features and all other features. See the Create a Network article.
Administrator – somebody who has access to all the administration features within a single site.
Editor – somebody who can publish and manage posts including the posts of other users.
Author – somebody who can publish and manage their own posts.
Contributor – somebody who can write and manage their own posts but cannot publish them.
Subscriber – somebody who can only manage their profile.