These instructions explain how to customize the footer of the user portal.
Log in a Super Admin -> Config Dashboard
On the blank portal page, select: "This is a special page type" and select "Footer"
You can load the default footer and make changes from there.
NOTE: If your footer has a height larger than the current default footer then you may want to increase the top margin of your foot so it doesn't overlap buttons on some of the Admin pages.
To do that add the following script to your footer HTML. You can adjust the height accordingly based on your div height.
document.querySelectorAll('[ng-include="\'/theme/_footer\'"]').style.marginTop = "220px";
<div class="footer" style="height:200px">
<strong>Copyright</strong> © 2017-2018 Medium One, Inc. All Rights Reserved.