leaderstat rank wont work?

I cant seem to get this code to work.

    game.Players.Glassify.leaderstats.Rank.Value = Head Scripter 

I am trying to make my rank on the leaderstats Head Scripter but it wont work the other code that interacts with this code is the following.

local playerStats = {} --this keeps a list of the stats for each player that enters the game

 game.Players.PlayerAdded:connect(function(player)
     local leaderstats = Instance.new("Model", player)
     leaderstats.Name = "leaderstats"

     local grouprank = Instance.new("StringValue", leaderstats)
     grouprank.Name = "Rank"
     local rank = player:GetRoleInGroup() -- Insert the group ID for whatever group you want ranks displayed for here. 


     if rank ~= 0 then
         grouprank.Value = rank
     else
         grouprank.Value = "Guest"
     end


     playerStats[player] = leaderstats 
 end)