Boonex removed it as default on the editor in one of the early 7.1 versions.
If you want it, edit the following file. templates/base/scripts/BxBaseEditorTinyMCE.php
Look for this.
protected static $CONF_FULL = "
plugins: 'autolink,autosave,lists,table,inlinepopups,media,searchreplace,print,paste,fullscreen',
width: '100%',
height: '320',
theme: 'advanced',
theme_advanced_buttons1: 'bold,italic,underline,removeformat,|,sub,sup,|,bullist,numlist,|,justifyleft,justifycenter,justifyright,justifyfull,|,undo,redo,|,outdent,indent,blockquote,formatselect,|,hr,link,unlink,image,media',
theme_advanced_buttons2: 'anchor,|,tablecontrols,|,visualaid,|,search,replace,|,print,|,fullscreen,cleanup,pastetext,code',
theme_advanced_buttons3: '',
theme_advanced_toolbar_location: 'top',
theme_advanced_toolbar_align: 'left',
theme_advanced_statusbar_location: 'bottom',
theme_advanced_resizing: true,
theme_advanced_resize_horizontal: false,
theme_advanced_resizing_use_cookie: true,
";
Change it to this. Add the two additions in GREEN.
protected static $CONF_FULL = "
plugins: 'emotions,autolink,autosave,lists,table,inlinepopups,media,searchreplace,print,paste,fullscreen',
width: '100%',
height: '320',
theme: 'advanced',
theme_advanced_buttons1: 'bold,italic,underline,removeformat,|,sub,sup,|,bullist,numlist,|,justifyleft,justifycenter,justifyright,justifyfull,|,undo,redo,|,outdent,indent,blockquote,formatselect,|,hr,link,unlink,image,media',
theme_advanced_buttons2: 'anchor,|,tablecontrols,|,visualaid,|,search,replace,|,print,|,fullscreen,cleanup,pastetext,code,emotions',
theme_advanced_buttons3: '',
theme_advanced_toolbar_location: 'top',
theme_advanced_toolbar_align: 'left',
theme_advanced_statusbar_location: 'bottom',
theme_advanced_resizing: true,
theme_advanced_resize_horizontal: false,
theme_advanced_resizing_use_cookie: true,
";
NOTE: On the plugins line, make sure the plugin name emotions is at the beginning of the line, and not at the end. For some reason it would not load on my site when it was at the end. Unknown as to why.