Halo 5 Call Sign

Games Halo 5: Guardians
#1

Is there a way to change my H5 call sign on Halo Waypoint? Or will I need to wait until I get into the game?

#2

I don’t see a way to change it. Might have to wait until the game drops

#3

In-game option.

#4

> 2533274796457055;3:
> In-game option.

Thank you. =)