http://www.oxwall.org/store/item/569
This ^ Still works on 1.75. Worth Checking out for newer versions too. Its a simple override of the oxwall wysiwyg.
Edit - Although the non standard implementation of the 'textarea' call in different plugin, makes it a bit frustrating.
Try editing 'init.php' at around line 40 to...
toolbar_Basic : [
[ 'Bold', 'Italic','Underline','NumberedList','BulletedList', 'Link', 'ow_image', 'ow_video' ,'Source','Undo','Cut','Copy','Paste','PasteText','PasteFromWord','BulletedList','-','Outdent','Indent','-','Blockquote','CreateDiv',
'-','JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock','Styles','Format','Font','FontSize','TextColor','BGColor','Smiley']
],
toolbar_BasicDynamic: [
[ 'Bold', 'Italic','Underline','Cut','Copy','Paste','PasteText','PasteFromWord','BulletedList','-','Outdent','Indent','-','Blockquote','CreateDiv',
'-','JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock','Styles','Format','Font','FontSize','TextColor','BGColor','Smiley']