I don't know that Kraken is an exchange I just make small research about it and I see that you can buy/sell cryptocurrencies there.
Well that is exactly what an exchange is.
But I don't know if my country currency is listed there trading. And the website looks like decentralized exchange.
What do you mean? Kraken is a centralized exchange and if you look at their website, they will ask you to sign up and there’s the whole KYC process. Which should have told you enough that it is indeed centralized.
And I was trying to register for the app but it only loading for the country page. I will check it out later when works. Since Nigeria is part of the country listed in the registration process then I believe it will be in the p2p trading too.
If your country is included in the choices to register in the platform then maybe the concern is on your side. Maybe low internet connection? Or the device is just loading a lot.