Start on your Home screen. Tap the three-line menu button in the upper-left corner, then tap "Payments" to reach the Payments Portal screen. Then tap the "Statements" button to reach the Statements screen.
Here, invoices from your center are organized chronologically. To open a specific invoice, tap the invoice you'd like to see. If no invoice is visible or you'd like to generate the most recent invoice, click "Generate new invoice to date".
A web-based PDF of the invoice will open. If you would like to share or print the invoice, tap the share icon on the bottom right of the screen. When you're done viewing the invoice, tap "Done" in the upper left of the screen to return to the Statements screen.