If you've noticed an issue with the app that you'd like to let us know about, please click the 'Help' link on the left-menu.
Once you reach the Help screen, you'll see a 'compose' icon, top right of the screen. Click this and you can leave us a note, letting us know the problem you're having.
It's worth checking through the help articles first, as the answer to your problem may already have an FAQ.
Alternatively, you can email email@example.com with your feedback.