Go to your billing page, click on the "Invoices" tab at the top right corner of the screen where you can see your recent invoices listed.
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To open an invoice, click on the "View invoice" button for the invoice you want to see in detail. 

To save or print your invoice as a PDF use your browser's Print option. 

To change your billing address, click on the "Details" tab, scroll down to the "Billing Info" section and fill in the new information, click on "Update Info". Then, you will see your updated invoices.