1, QQ personalized signature cannot be changed, which may be related to background data conflict. You can try to modify from multiple channels.

2. The first method: open the QQ login interface and log in the QQ number. Open the initial QQ interface, click the "Edit Personality Signature" dialog box, and directly enter the text.

3. The second method:: Click on your QQ avatar to pop up the profile panel.

4. On the Profile panel, click the Edit Profile button.

5. On the data panel that pops up, there is a personalized signature dialog box, where you can delete the old signature and enter a new personalized signature.

6. After entering the new signature, be sure to click the Save button, otherwise the new signature will not be displayed.

7. The third way: Click the space icon on the initial QQ interface to open your own QQ space.

8. Enter a new signature in the personalized signature setting box in the personal center interface, and remember to click the Publish button after the input is completed.

9. None of these three methods can be modified, so it may be system maintenance.