Click My Account and select Pay Invoices.
Select the invoices to view by clicking the Current, Over 30 Days, Over 60 Days, or Over 90 Days tabs.
To view invoice line item detail,
click 
to the left of each invoice.
Click the check box corresponding to the invoices for which you want to print a remittance form or pay by credit card. To select all the displayed invoices, click the All checkbox.
To print a remittance form, click Print Remit Form. The form opens as a PDF. Click the File menu and select print, or type Ctrl + P.
To pay by credit card, click Pay By Credit Card. The Cost Center and Payment Method boxes open. To change the cost center information, click Edit. Enter the new address. Click Save. To specify the credit card information, click the down arrow to select the credit card type, Visa or Master Card, for example. Then specify the credit card number, and its expiration date. When finished, click Process Payment.