Step 1: Login into your WordPress site in your Dashboard go to Appearance.
Step 2: Click Theme File Editor.
Step 3: There you will find the file named Theme Footer or footer.php (before editing the file copy the content to a notepad file so that if something gets wrong you can paste original code back in to start again).
Step 4: There you will find a code for original theme which will look like this:<?php (‘name’); ?> is proudly powered by <ahref=”http://wordpress.org/”>WordPress</a>
Step 5: Place mouse right before the original code </footer> tag and press space bar and add your script.
Step 6: Click Update and the footer will be changed
Your IDEX Pro web script is now installed.