How can I remove this pop up ad app?

I downloaded this game from a website and the next day I started getting random pop up ads on my home screen. When I looked at what app it was it was "Promotion". I've tried searching for the ad on "Easy Uninstaller" but I couldn't find it or a random app which I didn't install, please help me!

Try this, long press that small icon left of 'Promotion' and then tap 'i' (info). This should show you which app is pushing those ads.
Attachment 295661

Thank you, I got it fixed now :)