Case A: If you have a membership with eAdventist, you can follow the following steps :

Step 1

Step 1.1: Login to eAdventist as a member with valid credentials.

Step 1.2: Click on the "organization/officers" button.

Step 1.3: On the organization detail page, click on the "Edit Organization" page.

Step 1.4: On the website field of the edit organization page, provide the new website URL.

Step 1.5: Click on the "Save" button.

Step 2 :

Contact Lonny at Adventist Church Connect and request a downgrade of your existing site.

Lonny's contact details :

Phone number :  (877) 518-0819 

Email address:  lonny@adventsource.org

Case B: If you have a custom domain of your own, you can refer to the following articles:

For Cloudflare: https://help.oneaccord.cc/articles/setting-up-custom-domain-for-your-website-for-cloudflare-fd7e7

For Godaddy: https://help.oneaccord.cc/articles/setting-up-custom-domain-for-your-website-for-godaddy-bb2e8

For Amazon: https://help.oneaccord.cc/articles/setting-up-custom-domain-for-your-website-for-amazon