I also had a problem that I could not swipe Upday to the screen from left on my Samsung A3. So I uninstalled Upday and reinstalled, but there was still the same problem... Finally did the following and got it working:
1. Uninstall Upday (Settings-> Apps -> Upday -> Uninstall)
2. Go to Home-screen -> press and keep finger on any empty space on homescreen -> then swipe right. Upday is still visible there -> Disable it by toggling the button -> Press middle button to go back to Home screen
3. Go to Play Store-> Download Update application: "upday - Local & World News" (has a lighter blue icon)-> Install it
4. After that, in Play Store, download "Upday for Samsung" (has darker blue icon) -> install this one too
6. Now , it should work
At least I did not have to find a localized version for United Kingdom (which I don´t even know how to look for it. ) The versions on Play Store looked like they came from Germany, because the names of the downloads were something like upday GmbH.