Please note that Cloudpit customers do not have a credit system. so you can't manage / add credit here!
You can see the balance in the control panel under Account.
As soon as a credit has been loaded onto the easyname account, you can use it to purchase new domains and hosting products, as well as extend existing products. If one day there is not enough credit for the automatic renewal of your products, you will be informed in good time by a reminder email.
You can top up credit at any time in the control panel. You can do this under Account and then on Top up credit.
To do this, enter the desired amount in the upper field and then select the payment method in the lower field.