To freeze your card, please go to your “Wallets” in the left-hand menu, click on your card’s wallet and point the mouse cursor on the card. Click on “Freeze card” and enter your Two-Factor authorisation code. Now you can find it in the “Blocked” section.
To unfreeze your card, you need to choose the “Blocked” section, point the mouse cursor on the card and click on “Unfreeze the card”. Then enter your 2FA Code in a popup window.