Help with splitting players into two teams?

I cant seem to get the players on the teams can anyone help? plrs is a table of players dont worry.

plrs = IsOrNotAfkTable(false)

local Red = Instance.new("Team", game:GetService("Teams"))
Red.TeamColor = BrickColor.new("Really red")
Red.Name = "Red"
local Folder = Instance.new("Folder", Red)
Folder.Name = "leaderstats"
local Hits = Instance.new("IntValue",Folder)
Hits.Name = "Hits"


local Blue = Instance.new("Team", game:GetService("Teams"))
Blue.TeamColor = BrickColor.new("Navy blue")
Blue.Name = "Blue"
local Folder = Instance.new("Folder", Blue)
Folder.Name = "leaderstats"
local Hits = Instance.new("IntValue",Folder)
Hits.Name = "Hits"

function assignTeams()
    local balanceTolerancy = math.floor(#plrs / 2)

    for i = 1, balanceTolerancy do
		-- player's indexed here will go to team1
    end

    for i,v in pairs(plrs) do
		 --check if the player is on team1, if not then assign to team2.
	end
end

You can set a player’s Team or TeamColored property to change their teams. You can read this as well to know what team they’re on.

For what you put in comments you can do this:

plrs[index].Team = Red

And based on what you asked in the second comment:

if plrs[index].Team == Red then
    plrs[index].Team = Blue
end

However that second code will just move them all to Blue, if you want a balanced team, try this article: https://developer.roblox.com/en-us/articles/team-balancing

Or you can check the bottom of this page: https://developer.roblox.com/en-us/api-reference/class/Team