Hello Jeff,
Thank you for reaching us!
We cannot provide you support for a module or extension that is not our own, however we can help you solve your current problem. Go into the source code of your signup form and find the submit button. Notice the two examples-
<div class="clear">
<input class="button" id="mc-embedded-subscribe" name="subscribe" type="submit" value="Subscribe">
</div>
And replace them with this:
<div class="buttons">
<div class="left">
<input class="button" id="mc-embedded-subscribe" name="subscribe" type="submit" value="Subscribe">
</div>
</div>
If you would like to get help on styling the form and adapting it with the Garmento theme, we can assist you, but since this is not part of your 1 Year Premium Support License. We will just need a brief commentary or a screenshot explaining the overall look.
Hope this helps!