Subdomains are a simple way to get a vanity name for your game server. Instead of players connecting with the IP address and port, they can connect with just a name like stevecraft.evlbox.io. Subdomains use SRV type DNS records so even if you don't have the default game port players won't need to enter a port number (currently only supported by minecraft)
Want multiple subdomains? Contact support and we can allocate you additional subdomains free of charge (limit 5)
In Nitro panel click the subdomain menu
Then in the dropdown choose a domain you'd like to use and then enter a name. Do not enter a server port! The port will be taken care of automatically.
Depending on a players interenet provider / dns settings it may take 15-30 minutes for the name to start working, though most users can use it instantly.