I'm borrowing the MAA's post to say the same thing about GoAs.

If you have a request that needs to be updated on your Grant Of Arms, you MUST fill out the form and submit it. If you email it in you will just get a reply saying to use the form. USE THE FORM.

The form can be found here: http://www.darkjedibrotherhood.org/dbjedi/hrld/goareq.html
<table cellspacing="1" cellpadding="0" border="0">
<tr><td></td><td>Dark Jedi Master Kaine Archon Mandaala
Herald of the Dark Brotherhood
[SC-SoP/DC]
"Fear will keep order"</td></tr></table>