Do you mean you want to block some web sites?
If you have the model using the ASUSWRT software, from the main menu, click on Firewall in the Advanced Settings category.
Then click the URL Filter tab. In the Basic Config, make sure you have Enable URL Filter = enabled
Then you can add specific domains.
e.g. facebook.com
Don't forget to click Apply after you've added the domains.
You might find you also need to go round each computer on the network, to clear their caches of IP addresses, before your URL Filter can take effect. OpenDNS has a good FAQ article on that subject, so no point in me repeating it. See here:
https://support.opendns.com/entries/26336865-Clearing-the-DNS-Cache-on-Computers-Servers-and-Web-Browsers
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