First, you need to open your QQ page and click on your avatar.

After clicking, a picture like the one below will appear on the computer page. Click to edit the information.

After clicking Edit Information, you can edit it below. Both your personalized signature and personal description can be changed. Click on your personal description to delete the previous content. Enter new content.

After completing the input, click the save button on the upper right to save.

In this way, your QQ personal description has been changed successfully.