You can update your credit card information as follows:
1. Login to your EDTHosting.com billing control panel at https://controlpaneldnp.edthosting.com/billing
2. Click on "My Details"
3. Click on "Change Credit Card Details"
4. Update your information and click "Save Changes"
You can also call EDTHosting.com at 1-877-455-7108 and update your billing information over the phone