Go to the main page of the site, select the server and the donat you want to buy, enter your nickname.
You can enter a promo code if you have one. Next, press the button "Buy"

Choose a convenient payment method and follow the instructions of the payment system.
If you have not found a convenient method of payment, click on the button "Other ways #1" or "Other ways #2"

Enter your details in the fields, depending on your payment method, and then - pay.
Внимание! Don't forget to keep the receipt after the purchase, you may need it when restoring your account.

You have successfully purchased a service. Now, all you have to do is log in to the server under your nickname and enjoy the game with privilege!