When you're in a section you want to leave feedback about, hold down the physical Power + Volume Down buttons. That opens the feedback to the section you want to comment on. For example, if you're in the Windows Store app, and hit the buttons, you're brought directly to the Windows Store section of Windows Feedback. You can also access it at any time from the All apps list
Lol Yes I did just notice that.. But there should be an app in the app list named windows feedback.. Otherwise check under settings if the feedback option is still there (I currently have 8.1 so I can only help with what I can find on the net)