If you pay with a card, you can change your billing email, company info, or card on file right in your Profile summary.
Click 'Update information' or 'Add payment method'.
Update the relevant fields and save your changes.
Please note that these changes only apply to your future billing details. If you need to update the email address associated with your Icons8 account, you'll need to do that separately in your Settings.
If you're using PayPal, you can update your details during the invoice download.