You can also block access to all websites except those you specify.
Press the F5 key to access Advanced setup.
Click Protection → Web access protection and expand URL list management. Click Edit next to Address list.
Click Add and type or copy/paste the link of the websites you want to block. To add multiple websites, click Enter multiple values, type or copy/paste the website links and select a separator for multiple values. Click OK → OK.
Click OK in the remaining open windows to exit Advanced setup.