Start the server
Open your server in the panel and press Start. Wait until the console reports that the server is ready.
Find the address
Look for the server address in the panel’s server overview or allocation/network information. Copy the address exactly. If it includes a port, keep the port too—for example, play.example.net:25578.
Add it in Minecraft
Open Minecraft Java Edition, choose Multiplayer, then Add Server. Enter any server name and paste the address into the server address field. Select Done, then join.
Check the version
Your Minecraft client version must match the server version. If it does not connect, confirm the server is online, check the address and port, and try the version selected when the server was created.