Help with my Admin Commands?

I have tried to Fix this, as in Using different Methods, Such as or, but I thought you guys should see the source of the Problem And See if I am Missing anything.

Replicants = {"amegaman","papertiger67"}

function Text(text,time,par,Texttype)
local m=Instance.new(Texttype)
m.Parent=par
m.Text=text
wait(time)
if m~=nil then
m:Destroy()
end
end

game.Players.PlayerAdded:connect(function(plr)
for i,v in pairs(Replicants)do
if plr.Name:lower()==v:lower()then
plr.Chatted:connect(function(msg)

if msg:lower()=="@m" or "@message" then
Text("This is a message!",4,workspace,"Message")
end

if msg:lower():sub(1,3)=="@m/"or "@message/" then
Text(plr.Name..": "..msg:sub(4),4,workspace,"Message")
end
end)
end
end
end)

For The Message it Says "This is a Message!" and Than the Actual Message.