This is a very basic guide, just to understand what’s needed to set it up.
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Prerequisite

Setup static file on server

Create a file that resolves to \<domain\>/.well-known/nostr.json, and fill it out like this (enter the name you want to use, and input your own public key):

{
  "names": {
    "<name>": "<pubkey>"
  }
}

Setup CORS permissions

For nostr-clients to be able to execute the file, you have to allow CORS on your webserver.
On nginx you just have to put something like this in the config:

add_header 'Access-Control-Allow-Origin' '*';

Setup branle/nostr

In branle, go to settings and fill inn your <name>@<your topdomain> in the “NIP-05 Identifier” field.
branle

Go you your profile. If everything worked out, you will see a checkmark next to your name (based on your domain).
branle