For payments with a Credit/Debit Card just click on purchase when you are inside your preferred account description, choose PayPal if you want to check out with PayPal's credit/debit card option or click on credit/debit card to pay with the card directly on Selly. 
Next, you have to enter the email to which you want the code automatically sent after the payment is completed.  Continue to PayPal.
Now you can face one of two types of login.  If you check out with more than $10, you will get to the login from picture number three. Every value below will forward you to the login from picture number five. If you check out with more than $10, please click on "Pay with a credit or debit card." 
Enter your card details into the correct fields and finish the payment. 
This is the second type of checkout; here you have to click on "Create an Account" to continue. 
This is a PayPal Guest Checkout where you can enter your card details to 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 folder.