Good morning! If you accidentally delete your personality, signature or other information in the future, it will not change as long as you don't click OK.

After the background is deleted, you can click "Menu" in the lower left corner of the QQ interface, place the mouse on "Settings" in the pop-up menu, and then click the pop-up "Personal Settings". Then you can edit it in "Personalized Signature" and save it. That’s it