Issues with WordPress on new domain

My site is https://terrellcreative.com/ and I wish to move it to my new domain, onpointproducts.com. In the meantime, onpointproducts.com redirects to terrellcreative.com, and I’ve been using onpointspecialtyproducts.com to test out how I’m going to do the transition.

Our parent company hosts our server for us, and we bought domain names through GoDaddy. The current system configuration is available here.

Anyways, I have the DNS record pointing to the correct IP address. I then tried to change the site URL by editing wp-config.php with: `define(‘WP_HOME’,’https://onpointspecialtyproducts.com’);
define(‘WP_SITEURL’,’https://onpointspecialtyproducts.com’);`

(per https://codex.www.ads-software.com/Changing_The_Site_URL)
However, that still resulted in just the IIS7 splash page. I did discover that with those settings, I could view the homepage by going to https://onpointspecialtyproducts.com/terrell/terrell/wp-content/index.php. How can I have onpointspecialtyproducts.com send the user to our homepage (like on terrellcreative.com) instead of the IIS7 page?