QQ settings do not allow anyone to add friends?

1, in the computer login QQ and then in the panel I click on the "System Settings" button, details as shown in the following figure

2, then in cut to the QQ system settings, we click the "permission Settings" details as shown in the following figure

3, and then open the "Permission Settings" Interface window, we click on the following "anti-harassment" as shown below

And then here we can set up some questions that you can be very difficult no one knows, so that will not add you oh, at the same time if you do not want to temporary session, we just have to select the following temporary members.