Contact App Developers - HTC One® (M8) for Windows®
Depending upon the app, the process for contacting the developer may vary.
From the Start screen, swipe left to display the Apps list. Alternatively, tap All apps (located in the lower-right; may require scrolling to the bottom of the Start screen).
Tap the app.
Swipe left or right to locate then tap 'support' or 'about'. If 'support' or 'about' are unavailable, navigate: More > about [app name] > Contact [developer name] then skip to step 5. If the above option is also unavailable, feedback can be provided using Marketplace Ratings and Reviews.
Tap 'feedback and support' or 'feedback'.
If applicable, tap an email account in which to compose a message.