Facebook applications are small programs that you can add to your Facebook page or profile. HTML boxes are one of the many free applications available. You can use these boxes to insert HTML codes for a wide variety of purposes, such as adding other applications, images, videos, tables or links. You can also use HTML codes to perform advanced formatting and text editing.
Log in to your Facebook account.
Click on "Home" in the toolbar at the top of the page.
Click on "Apps" in the menu on the left side of the page.
Click on "Apps Directory" in the bottom left corner of the page.
Type "HTML Box" in the search box in the top left corner of the page.
Click on any of the HTML applications in the search results page.
Click on "Info" in the menu on the left side of the page.
Click on the "Go to App" button at the top of the page.
Follow the installation instructions for the application you are using.