Server Name-> Server Name is a local name for a server on your dashboard this is a just an identifier.
Display Name -> Display Name is the public name of your minecraft server. This is shown everywhere and on the connection page.
Subdomain -> Select your favourite subdomain for your players to visit the connection page for the connection information.
Protocol -> Select the protocol of your server. Currently TCP is only available.
Destination IP -> Your origin IP where your minecraft server is hosted.
Destination Port -> Your origin port where your minecraft server is hosted.
Maximum Connection Per IP -> Maximum connection a IP can have to your server. 2 is more than enough for most game servers, If your server requires more than 2 connections simultaneously feel free to increase it.
Background Image URL -> URL for the background image on the connection page. Refer to Player Flow.