First, login to the billing system here
Or here if you are a NH by UKHost4u customer.
Once logged in, you’ll see the following icons:
Go to “Invoices”, and you will see a list of your invoices:
For an unpaid invoice, select the “Unpaid” box in the Status column. This will bring up a view of the Invoice, where you can select “Pay Now”. This will bring you to a screen where you can enter the card details to pay the invoice with.