I've added that domain to your account for you. Please note that it may take up to 2 hours for your new domain to fully work. If after a full 2 hours it doesn't work on your side, please make sure you clear your web browser cache: https://wiki.helionet.org/Clear_Your_Cache
In the meantime, please make sure you configure DNS for the new domain. You can either:
1) Set NS records pointed to the HelioHost nameservers: `ns1.heliohost.org` and `ns2.heliohost.org`, or
2) Manually create DNS records:
a) Add an A record (IPv4) pointing to your server's IPv4 address
b) Add an AAAA record (IPv6) pointing to your server's IPv6 address
To find the correct IPs, please go to: Login > Plesk > Websites & Domains > [domain name] > and check at the bottom of the page.