Box Authentication using APP token with SDK

Hi,

I'm trying to implement box integration using .Net SDK APP token authentication method.

In the App token authentical documentation the below code is available but how can I create app token in the developer console while creating a new app.

I can see Client ID, Client secret and public-private key JSON in JWT authentication but I didn't find any APP token generation to use it in SDK in the dev console of box account.

Can anyone guide me to create an app token to use it in my integration? Which key should I use from app configuration as APP token in code?

Thanks in advance