In order to order hashrate you need to click Buy Hashrate in the left menu, choose hashrate and use the slider to set the amount. Then click the Proceed button. On the next screen you will see the pre-invoice. If you are happy with your order, click on the checkbox below that reads "I confirm that I have read and agree with Terms and Conditions." and click the Proceed button. You are now in the payment selection screen where you are to choose from BTC and USD payment methods. Upon selecting the method you will be taken to a page with the information how to pay for your purchase. If you selected wire transfer as the selected payment method, please check the invoice that is sent to your contact email address for bank details.