Multiple Blogs on multiple domains

I have searched and searched, but I cannot seem to find an answer to this one…

I have multiple domains that I want to manage through WP (www.domain1.com, https://www.domain2.com, etc). My Web host is GoDaddy and each domain has its own hosting account. I went in and set up my first WP blog, on https://www.shopfortcollinsfirst.org, through the GoDaddy admin panel. It works! I receive an email stating that my WP blog has been set up and when I go to shopfortcollinsfirst.org, it defaults to the WP “Hello World” theme. All is good.

But then, when I go into another hosting account, also hosted through GoDaddy (realestateinftcollins.com), on which I want to set up a SECOND WP blog, it says that WordPress has already been installed. Puzzling.

I did some research and found that putting the following snippet of code into the wp-config.php file is supposed to provide a solution:

define(‘WP_ALLOW_MULTISITE’, true);

I put this snippet into my wp-config.php file on the server for shopfortcollinsfirst.org, save it, and upload it to the server. Now, when I log in to the WP admin site, I have a “Super Admin” panel that shows up. Progress!

Here’s my problem…
Under Super Admin > Sites, it has the “site address” field set to shopfortcollinsfirst.org, followed by an entry field. I do not want my new blog to point to any part of shopfortcollinsfirst.org; I want it to point to realestateinftcollins.com.

What am I missing? Seems like there should be a very simple solution here, but I am not able to find it. Any help would be greatly appreciated. Thank you!