Your funnels should live on your own domain. Connecting it means adding DNS records at your domain registrar or DNS host, such as Cloudflare. Email sending needs SPF, DKIM and DMARC records too.
Use a subdomain for each purpose when it helps, like www for the site and app for a members area.
Do it step by step
- Buy a short, clear domain.
- Add the records your funnel builder asks for.
- Add email authentication records.
- Wait for the records to update, then test.