How do I delete Torch off of my mac???

I was trying searching for something to convert youtube videos into mp3. And one site made me download Torch. It looked harmless but now I regret the download. I cannot uninstall or delete/trash this browser called Torch as well as YTD. Since I have installed both, whenever I open a new window it automatically goes to the Yahoo search engine.

I would like to uninstall this and have my windows back instead of Yahoo popping up.

Please help