Log into Realm and look at the top right of your screen. You should click on the "+" icon, here:
You will be redirected to either Xsolla or Steam's payment page, depending on the platform you're playing on.
Xsolla
You will be prompted to select the amount of Realm Gold you want to buy, like so:
After selecting your desired amount, you will have to select your country and payment method:
Make sure to select the country you're currently in from the drop-down menu the arrow in the screenshot is pointing to. Keep in mind that different payment methods are available in different countries. If you're not seeing the payment method you'd like to use, chances are that it is unavailable in your country. If you wish to enquire more about payment methods please contact our billing partner Xolla.
After you've selected your payment method, you will have to fill in your details (card number, PayPal information, etc.) and you will be ready to complete your purchase!
Steam
You will be prompted to select the amount of Realm Gold you want to buy, like so:
Once you've done that, you will be redirected to Steam's payment page:
Keep in mind that you should have the appropriate amount of funds in your Steam Wallet in order to successfully complete the purchase. Once you're ready with filling in your details, you can click on the "Authorize" button.
Done!