You’re welcome to add in any HTML/text you’d like to. Here’s how:
Go to the Appearance section in your WordPress dashboard and choose Edit.
From the list of files on your right, choose footer.php
I would suggest adding in your new code right above this line:
To make it easier to style, I would do something like this:
Your code goes here
How to center it depends somewhat on what is being centered. One option would be to center align the div and then absolutely position it in the footer with the width set to 100%. If the content isn’t too much, that’s the easiest. If it’s not, you may want to float it to the left and add a margin-left to it to push it to the middle.