Send data to node (From gateway or LoRa Server)

Can you help me? I want to send data to node but I dont know how to do it, thank you!

This has been asked before: https://forum.loraserver.io/search?q=send%20data%20to%20device.
See also the docs: https://www.loraserver.io/lora-app-server/integrate/sending-receiving/.