To get Facebook Social Plugins Like Box you must have a page, if you do not click here and learn how to create a Facebook page
If you already have a Facebook page, click on the link (https://developers.facebook.com/docs/plugins/page-plugin)
Fill in the fields:
URL to Like: The link of your Facebook page
Choose the options and click the Get Code button
Choose the IFRAME option
After obtaining the code go to the Control Panel >> Banners >> Add / Insert >> In the HTML field enter the code