No worries, thanks for clarifying. I've added that domain for you, it'll take effect in about 10 minutes. If you haven't switched to HelioHost's nameservers, you'll need to create an A/AAAA record to Johnny's IP address.
Main domain changed. it can take up to 2 hours for the new domain to start working. Since changing a domain has a risk of data loss, you can download a backup of your account before the domain was changed at https://heliohost.org/backup