Open your QQ space and enter the "Personal Center". There is a navigation under your space name, which is to guide others to your "home log music album" and other content columns. One of them is called "Let's talk". Clicking on it will open a new page. In the upper right corner of the page, your "conversation" will be displayed. These are all your old signatures. When you click on it, all the signatures will be displayed. You can delete anything you want.

Note: Some people can't see the "personal center" in their own space. You can double-click the QQ tray in the lower right corner of the computer, and then you will see a five-pointed star-shaped sign with a "Z" on it, which is the personal center of your space. Then follow the steps mentioned above.