Getting an orderded datastore from a list datastore?

local DataStoreService = game:GetService("DataStoreService")
local MainDataStore = DataStoreService:GetDataStore("MainDataStore")
local InfectedLeaderboard = MainDataStore["TotalInfected"]
local InfectedLeaderBoard = DataStoreService:GetOrderedDataStore(InfectedLeaderboard)

I'm trying to create a global leaderboard and I save everyone's progress in a table. I have tried multiple ways but it keeps giving me this error

TotalInfected is not a valid member of GlobalDataStore

Any ideas?

Try :

local InfectedLeaderboard = MainDataStore:WaitForChild("TotalInfected")