How to add face text when sending SMS on iphone4?

When sending SMS to iphone4, the operation of adding face text is as follows:

As shown in the figure, click the icon similar to "ball" in the keyboard to switch the expression function.

Note: If you switch the handwriting input method, you need to add. The operation is as follows:

First: First, find the "Settings" icon on the main interface of iphone4, and then click Enter.

Second: After opening the settings, click General on the left, then find the keyboard in the right pane, and click to enter the keyboard settings.

Third: Then click "Keyboard" in the keyboard settings, and then select "Add Keyboard" to add "Emoji".