1) enter QQ first (my current version is V4.7.0.2 155).

2) Then click Settings → Permission and Privacy → Personalized Signature Synchronization.

3) Return to "I", click the personalized signature and edit.

See that "what to do"? That's the look. You can insert expressions into it at will.

4) Edit what you want to say, and enter the friend dynamics, and you can see that your speech (personalized signature) has an expression.

Thanks to the screenshot of 360 mobile assistant's mobile phone, the experimental mobile phone was given to diaosi by Xiaomi, a claw machine.