First, click on your current account balance and click on the "Top-Up" button at the bottom.
Next, select how much MYST you would like to add into your account and your payment method (crypto or fiat).
For Fiat top-ups you then have to choose the fiat payment currency you'll be using.
You will then be directed to a screen where you can finish your transaction using your credit card.
Enjoy your privacy while unblocking the content from all around the world. 😎