D-Link DFL-600 - Manual (Page 71)

Enter a name for the new group of policy rules in the Policy Name field.
This name is used to reference the group of policy rules. You can also assign
this group of policy rules to a schedule (which is either Always or a schedule
you can create below). Finally, you can choose to Allow or Deny access.
Blocking Internet Domains
The DFL-600 will allow you to make a list of Domain names for which
packets will be filtered.
Clicking on the Domain Add link on the Policy Rules page will open the
following page.