Slide the signature to be deleted with your finger-from right to left (key),
Delete will appear, and then click. It's good.
If you don't understand, let me rephrase it.
1 Log in to the smartphone QQ (mine is Android).
Click "I" in the lower right corner.
Click on the line of your vest (personalized signature bar appears on this page, don't click).
4 My information
5 Personal signature (if you can't see yourself, write another one in the vest column) Slide the line of signature you want to delete with your finger-from right to left, and it will be deleted.
Don't comment if you don't press the above, thank you for your support.
If you are satisfied, please accept it.