This article will teach you how to set up your site so it can be accessed from a non-salvationarmy.org domain.
Instructions
Go to your DNS settings at your domain provider (GoDaddy, etc)
Add a new CNAME record for wm4.salvationarmy.org
Go to the management portal (https://webmanager.salvationarmy.org/management)
Click Domain / Site Mappings
Select Create Domain, enter your custom domain, & click Save
Double click your newly added domain and click Add Site Mapping. You’ll then search for your site and click Select Site to map your site to this domain
Select your newly added site in the mapping list and click Set as Default