Joomla 3为文章管理员添加了新标签

This is Joomla 3.3. I want to add a tab to article add/edit. Basically I want to let user to change the content themselves according to a predefined layout.

Is there any tutorial on this?

EDIT

I want to create a plugin/module/component for article form. Meaning to say that want to add additional info/meta to the article.

You can add custom data to any of the core tables as described at Adding Custom Fields to Core Components (though #__content is slightly different). I've outlined how to do it for #__content at Joomla StackExchange.