After adding the item to your cart, click on the top menu that says "Checkout", fill the contact information and at the bottom of the page press "Proceed to Paypal". Complete the purchase process and you'll receive a purchase order number and your account will be created too (you can also do this with free items). Once we process it, you'll get the activation key by email.
You can also join the discord for support: https://discord.gg/QCT99uc