You need to have administrator privileges to be able to view your account invoices.
To view or download your Invoices -> click on your username at the top right corner of your screen to open your Account menu -> select Payment Plan.
Click on Payment Details button in the Payment Panel.
Click on Last Invoice | All at the bottom left corner.
Your last invoice will be loaded. You can forward your invoice, create a PDF or print it by clicking on the corresponding button to the right of the Invoice number.
To view a list of all Invoices -> select All Invoices.
Check for any unpaid invoices by clicking on Unpaid Invoices.