Once logged in, go to "Manage Account" at the upper-right corner of the site. Then click the "Billing & Subscription" tab on the left. Once you are there, on the third line down, you should see
"To view your invoices, click here"
Once you click, you will be taken to a list of invoices. Please click View/Print next to the invoice you would like.
It will automatically download as a pdf file - saving to a downloads folder that can be checked or changed in your browser settings. Unfortunately, Internet Explorer has been known to run into problems generating invoices - we recommend using Google Chrome or Firefox for best results.