bank details on order incorrect. Sorry for the delay

I just placed an order for a new phone.  The boxes to enter card information worked at first but the valid from date wouldn’t drop down and then eventually the page seemed to move on.   My bank consequentially declined the payment and informed me.  
 

ID sent message titles sorry for the delay.  Including the text below   I really want to update the payment information to complete the order.  BUT HOW?

“Thank you for choosing iD.

We apologise that due to the popularity of our current offers, we’re currently experiencing minor delays in processing orders ready for dispatch.

We are confident however that we will be able to prepare your order in the next 3-5 days. We’ll email you again to confirm when your order has been successfully processed and dispatched.

Once again thank you for being an iD customer, and we apologise that on this rare occasion we have been unable to provide our normal delivery service.”