How to restore the software when the SMS mark of Apple's mobile phone is deleted?

System: iOS 14.4

1. On the desktop of Apple's mobile phone, keep sliding the screen to the left, as shown in the following figure:

2. When you slide to the end, the application library will appear. Click the location of the application icon in the Social folder, as shown in the following figure:

3. Long press the "Info" icon, as shown in the following figure:

4. Click "Add to Home Screen", as shown in the following figure:

5. The icon of the information app can be redisplayed on the mobile phone desktop, as shown in the following figure: