Adding a Moderator

I do know how to add a moderator.
I do also understand that a moderator's nick color will be green.
How do I make it green?
I managed to do so for a moderator, but forgot the steps.
Anyone can help?

Admin Panel
User & Goups
groups
Create or click on the one that you have
Click on Modify if you have one al ready made
Make sure you will out every thing that is needed
Click on color Group Members
If you dont want anyone to join your group
Put it as closed group
Dont put it as Hidden then it will not sure up on you legend

My admin group and mod groups are hidden, they still show on legend

they shouldnt

Did you click on Show Group Color

Once you do that it should not be there