How to join the Surfshark referral program? How to use a coupon code? What is 2FA and why it's important? How to enable 2FA for multiple users? How to enable 2FA on your Surfshark account? What to do if I have lost or forgotten my email address or password? I need to change registration email. How can I do that? How many devices can I use with Surfshark simultaneously? Does Surfshark keep any details of user accounts? Do you keep any logs of my internet activities? Do you offer a free trial?