OOC, ADVERT, PM, etc color change!

[Ballerd]

This may be a dumb thing to ask but hey whatever, alright so I’m currently working on a gmod server and I’m taking some time and making it look great! I was wondering when people do OOC it says (OOC) Ballerd: Hey and the OOC color is the color of their job I want to make it a custom color and make it be like [OOC]. Any help would be great, thank you for your time and consideration
have a great rest of your day
-Ballerd