YouTube iFrame Box: This option will enable the YouTube iFrame Box. Usage: This button basically functions the same way as the previous (older) version of the YouTube button, with the exception that this button uses the newer iFrame feature. Simply copy the (long link) url of the YouTube video to be inserted. Choose your size from one of the presets, or customize your own. Additional options (for now) can be appended to the url by adding them in the HTML view of the editor.