You can update your card details online and through the app.

Website:

• Log in using your email address and password
• Click on 'My Account' on the top right-hand corner
• Click the drop down menu and choose 'Settings'
• Scroll until the section "Payment Card"
• Click on the 'Update card' button and enter the new details

App:

• Access the main menu by clicking on the symbol "≡" on the top-left corner of the app
• Select “My Account”
• Go to “Payment”
• Insert the new card details
• Click on “Update Card”