How to add brand in TTN3?

I want to add the end node to the brand, what do we need to do?

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The information comes from GitHub - TheThingsNetwork/lorawan-devices: LoRaWAN Device Repository. To add devices you will need to create a pull request. In the ideal world the manufacturer of devices does this as that have all the information required.

How to create a pull request?

Sounds like you need to check the Git and GitHub learning resources