Why does the App store keep popping up on my iPhone?

I have a brand new iPhone 5c, and I'm trying to go on the internet via one of my apps, but it keeps re-directing me to the App store to buy Candy Crush Saga. The internet works fine if I go on Safari, but it doesn't work if I use it on this app (Recipe Box). How can I fix that?

You can't fix the Iphone will only let you download apps from its app store

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