1. Log in to QQ and enter your account number and password in the login interface;

2. After logging in, click the QQ email button next to the QQ avatar on the main interface panel;

3. After entering the welcome interface of QQ mailbox, click the setting options above;

4. After entering the setting interface, drop down and find the column of personalized signature, and click Add Personalized Signature. After that, edit the personalized signature of QQ mailbox and enter the words or expressions you want as your personalized signature;

5. After editing the personalized signature of the new QQ mailbox, click OK to complete the modification of the QQ mailbox suffix mode.