I am trying to make it so when a player chooses a kit, they have a potion effect too. I have made it so that you get the potion effect when you choose the kit, but the only problem I have is that it broadcasts it in chat. Thanks for the help.
Well, this isn't really something that can be fixed. I don't believe that those who are not opped will see the message, but considering that you don't want the message shown at all, you probably want a different kit plugin if the one you are using does not offer a different solution. Otherwise, you can dig around in the files for your server software. I will take a guess that you use Spigot, although Bukkit and KCauldron/Cauldron should have similar files. They may have some setting that you can toggle. If not, then either a new plugin or modifying the...
...is your best bet.
Oh yes, and one more thing I just remembered. In the...
...file, there is an option for broadcasting the console to server operators. You can set that to false, which should fix the problem.