I have https://NiagaraRESA.niagara.resa-hq.org/xmlrpc.php

Your instructions state Please use https://YourUserName.wordpress.com/xmlrpc.php (replace YourUserName with your user name

I put in our user name, it did not work, wordpress.com is NOT part of the url the site that we are talking about is https://niagara.resa-hq.org/ we want blog posts on that site to automatically post to https://homestagingnewswire.com what URL would I put in the URL box?