For checking out with PayPal just click on purchase when you are inside your preferred account description, choose PayPal as the payment option and continue. 
Next, you have to enter the email to which you want the code automatically sent after the payment is completed. 
Now you can log into your PayPal account. There are two types of login.  If you check out with more than $10, then you will get to the login from picture number three. Every value bellow will forward you to the login from picture number four. Please log in and finish the payment.
When the payment has been completed successfully, the code should be sent automatically after a few seconds/minutes. Please check your email inbox or spam/junk folder.