I was developing for a desktop app and took three steps
public void authNewUser() {

constructFrobUrl()//flickr.auth.getFrob

createAuthURL()
//used os to open browser to the URL
“open http://flickr.com/services/auth/?api_key=“+ this.akey + “&perms=delete” + “&frob=” + this.frob + “&api_sig=” + this.sig

getToken()//flickr.auth.getToken
}