Yes, you can make a payment online. You will need to first login to the website.  Once you are logged in, please go to your My Account page.
 

From the My Account page, click on the View button. This will bring you to your Billing Detail page, which lists all of your open invoices.

Once there, you can select all or just some of the invoices you would like to pay for online with a credit card. Click on the Pay Checked Items button and you will proceed to the Make a Payment page for those items.