From Joomla! Documentation
Joomla! allows you to add your articles to a menu without leaving the article itself. This feature provides an efficient way to speed up the process of publishing articles by removing the need to close articles to then go to the Menu Manager.
This tutorial covers the steps to add a menu item directly when an article is edited:
前往「內容」 → 「文章」並點擊一篇已存在的文章來進入編輯；或是
在「內容」 → 「文章」頁面中中點擊「新增」來建立新文章，完成該填的欄位後點擊「儲存」。如果文章尚未儲存，按鈕不會顯現 。
Adding the Article to a MenuOnce you are ready to save your changes, choose the option Save to Menu
You will then be presented with the Menu: New Item page. Joomla will fill the Menu Title field but you can change it. Menu Item Type will already be set to Single Article. Remember to choose the correct Menu on the right for your item to appear in it.Note: This tutorial covers adding a single article to a menu but you can also assign multiple articles to a Category Blog page by setting a specific category or sub-category.
Click Save&Close and you will be taken to the Menus: Items page for the menu you added the article to.You should now see the article in the list of menu items.