After you've logged into the Mobile App, tap on the "More" menu option in the bottom right corner.
After the More menu loads, tap the "Online Statements" menu option.
If you haven't already, you'll need to accept the terms and conditions for Online Statement. If your account does not have a valid email address, you will be required to provide one before you can accept the terms and conditions.
On this screen you'll be able to view each month's statement. You can also tap on the dropdown menu below "Filter:" to view only your credit card statements.