[quote=@Ekreture]
I wanna join?
[/quote]

Your options:
#1: Become a vassal (I suggest to reds Not!Rome or pinks Mary Sue!Military state)
#2: Play as the northern maroon island at the extreme north (it isn't actually claimed as the guy playing it is now Teal)
#3: Play as the burned out wasteland on that island next to white in the south-west, though I am not sure if that location is plot relevant or not.