1. First, we need to turn on the setting function.

2. Find the "General" option in the drop-down menu and click to enter the next menu of "General".

3. We find the "Keyboard" option under "General" and click to enter the keyboard.

4. After clicking to enter, we can see that there is a sign of 4 on the keyboard above, which means that you already have 4 keyboards. Click to enter the management interface.

5. Then we click Add New Keyboard to enter.

6. Click Simplified Chinese to find the handwriting option, and then switch to the handwriting keyboard when typing.

7. At this time, we can switch to the handwriting function.