In Article, you meant joomla article?
We don't provide support for these kind of customization, but you can try to look for an extension for this purpose. Using Joomla Extension for those purposes is the easiest way.
Take a look at this extension:
extensions.joomla.org/extensions/content-sharing/bookmark-a-recommend/2532
Or look at this category,
extensions.joomla.org/extensions/content-sharing/bookmark-a-recommend
there are thousands of plugins for this purpose, most of them are "free" to use.
Regards.
Support & Development.