YOU DO NOT NEED TO CREATE A CHILD THEME!!!
Montezuma is different from most themes in that it uses virtual CSS and template files, which are saved in a database, so changes will not be lost. There is no need to create a child theme.
Zaralene, go to your virutal footer.php file (Appearance > Montezuma Options > Sub Templates > footer.php) and add the col12 class to the footer-bg DIV.
Change this:
<div id="footer-bg">To this:
<div id="footer-bg" class="col12">You can add whatever information that you need in this footer.php virtual file.
