Does the subject want to ask "how to change QQ personalized signature to this number without adding friends" as follows.

1. Open the QQ chat window, find the profile card in the upper right corner of the window, and click the nickname below the avatar.

2. After entering the profile editing page, find the column of personalized signature, enter or edit this number in the text box on the right, and do not add friends.

3. After the modification, close the profile editing page and reopen the chat window. You can see that your modified personality signature has been displayed in the data card.