Paying for the UNITY Program....

How do you pay? With the email that you provided? Paypal?

PayPal is an option. If you go through the process, then you see the payment methods that are available.

https://store.unity3d.com/shop/

You pay with a credit card. There may be other forms of payment, as well, but I'm sure a credit card is the most common. Just fill in the information you want on that page until you get to the payment page to review your options.

You can also contact sales@unity3d.com, I'm sure they'll help you out.