Click Web and Email → Web access protection andexpand URL Address Management. Click Edit next to Address list.
Figure 1-1
Select List of blocked addresses and click Edit.
Figure 1-2
Click Add, type the web address(es) of the site(s) you want to block and then click OK four times to close the windows and exit Advanced setup.
Figure 1-3
Wildcards and other recommendations
The wildcards * and ? may be used. For example, if you wanted to block all addresses from nk01.sample.com to nk98.sample.net, you would enter: nk??.sample.*