Comment to 'Does anyone know what part or module or widget that is the bottom toolbar in this photo? '
  • The code for this button is in mobile app App.js file:

    <Button vertical onPress={this.onMessengerMenu.bind(this)} badge={this.state.data.bubbles['notifications-messenger'] > 0 ? true : false}>
        {this.state.data.bubbles['notifications-messenger'] > 0 && 
            (<Badge><Text>{this.state.data.bubbles['notifications-messenger']}</Text></Badge>)
        }
        <Icon name="comments" type="FontAwesome5" solid />
    </Button>

    To change it to your own you can replace it with this:

    <Button vertical onPress={() => this.injectJavaScript(`window.location = '${BASE_URL}page/privacy';`)}>
        <Icon name="car" type="FontAwesome5" solid />
    </Button>

    Just change, page/privacy URL and car icon to your own, icon name can be any icon from FontAwesome5 set:
    https://oblador.github.io/react-native-vector-icons/