Click the Office button, and then click Excel Options.
In the left pane, click Trust Center. Then click Trust Center Settings.
In the left pane, click Privacy Options. Then click Research Options.
Click Parental Control.
Select the Turn on content filtering to make services block offensive results.
Select the Allow users to search only the services that can block offensive results.
Enter a password. Click OK, retype the password, and then click OK.