Wow, I didn’t even notice there’s no button for font size in the editor, oh well, you will just have to do it the old school way.
<span style="font-size:10pt">YOUR TEXT HERE</span>
Of course, you can also edit the default configuration of the editor. Open /wp-includes/js/tinymce/tiny_mce_config.php with a text editor, find $mce_buttons
and add fontsizeselect
into the array.
$mce_buttons = apply_filters('mce_buttons', array('bold', 'italic', 'strikethrough', 'fontsizeselect', '|', 'bullist', 'numlist', 'blockquote', '|', 'justifyleft', 'justifycenter', 'justifyright', '|', 'link', 'unlink', 'image', 'wp_more', '|', 'spellchecker', 'fullscreen', 'wp_adv' ));
(the above code placed the font size selector after the strike through button)
There’s a list of buttons you can add to the editor, and you can find the list on TinyMCE’s website here.