Waveshare Lora hat for Raspi to create node - how to?

(post deleted by author)

Have you seen the documentation ? In particular Lora Modem Basic Manual ?

Chapter 5.7 Join a LoRaWAN® Network
https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/3n000000vBPu/wL445xvjsMix3QXo3550ZHSJ.fa1Wadc9RZTmpzDPa0