Gang System - How do a player can join in it?

I’m working in a Gang System from 0.
And my question is it… How do a player can join in this group?

Ex: I’ve created a group called (“BLUES”)
And my friend wants to enter on (“BLUES”)

What function can I use to make it a “group”…
And it’s possible to count how much players have in it?

So much thanks!

It really depends on how you made your gang system…

Showing us the code would be helpful as well.

So you’re saying we should write the entire script for you?
Aw hell naw!