If you see a certificate warning, that's expected! Your subdomain is working, but you haven't set up HTTPS yet.
This is a placeholder page. To use your subdomain properly, you need to:
The certificate warning is normal because no SSL certificate has been installed yet.
As the website owner, you need to configure HTTPS using certbot or through your hosting provider.
Point your subdomain to your actual service by configuring your reverse proxy or web server.
Make sure your DNS records point to the correct IP address: 159.69.186.172
Example: Create an A record pointing from yoursubdomain.freedomain.meme to 159.69.186.172
If you're the subdomain owner and need assistance:
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