how to add button react native app.js

import { Button } from 'react-native-elements';
import Icon from 'react-native-vector-icons/FontAwesome';

<Button
  title="Solid Button"
/>

<Button
  title="Outline button"
  type="outline"
/>

<Button
  title="Clear button"
  type="clear"
/>

<Button
  icon={
    <Icon
      name="arrow-right"
      size={15}
      color="white"
    />
  }
  title="Button with icon component"
/>

<Button
  icon={{
    name: "arrow-right",
    size: 15,
    color: "white"
  }}
  title="Button with icon object"
/>

<Button
  icon={
    <Icon
      name="arrow-right"
      size={15}
      color="white"
    />
  }
  iconRight
  title="Button with right icon"
/>

<Button
  title="Loading button"
  loading
/>

var tapSpeed = React.createClass({
  render: function() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Tap me as fast as you can!
        </Text>
        <View style={styles.button}>
        !
        </View>
      </View>
    );
  }
});

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#FFCCCC'
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10
  },
  button: {
    textAlign: 'center',
    color: '#ffffff',
    marginBottom: 7,
    border: 1px solid blue,
    borderRadius: 2px
  }
});