There's a couple of ways of manually adding domains to your block list.
You can do this by typing in an exact domain that you want to block,
or you can use the RegEx filter and get wildcard domains.
The other way is by clicking the Blacklist or Whitelist buttons
that are throughout the Pi‑hole web interface,
and it will automatically add them.
Another thing you can do is you can manage which devices are connected,
and you can put them in different groups.