How do I redeem a PSN code?

Related questions

1. What is PSN card?
2. How do I use a PSN card?
3. Do PSN Plus cards expire?
4. How much are PlayStation Plus cards?
5. Does PS Plus work on all accounts?
6. Can I buy PS Plus from wallet?
7. Can a gift card be tracked if stolen?
8. Can I get PlayStation Plus without a credit card?
9. Can you turn gift cards into cash?
10. Can I trade in my ps3 for a ps4?

Tags

1. #codes
2. #entered
3. #select
4. #trial
5. #terms
6. #store
7. #dialog
8. #continue
9. #service
10. #enter
11. #redeem
12. #accept
13. #playstation
14. #confirm
15. #bottom
16. #correctly