Ok. What device do you have? If you have an android device, go to google play store.
if you have an Iphone, go to the app store, formerly itunes. If you have a tizen device, aand you canot find it in the tizen store, there is nothing you can do, as it os not available on the tizen os!
Please for the love of all that is holy, please do not post back asking how to download it on tizen!