so im trying to blacklist people from freebuild and i wanna make a custom messege when i blacklist them how do i

After blacklisting them, you can use /warn [name] [message] to add a note as to why they were blacklisted. Then, if you want to see later, you can do /notes [name]

You can also consider using /send [name] [message] to send them some mail that says why they were blacklisted, if you want them to see it when they login.

ok thxs haha im bout to blacklist some people today hehehaha THANK U GOODLY