you keep on pressing the app, as in, put your finger on it and dont let go. The app and the ones around it should begin wobbling and some might have an x next to them Click it, when it asks if ur sure, say yes. Most built-in apps like settings, safari, and youtube CANNOT be deleted though.
Place your finger on the screen and hold it there for like 3 seconds. The apps will get all shaky and there should be an x in the corner of them. Press the x and follow through with the whole "yes, I want to delete it" thing.