How do I make functions global?

(I would post this in a comment if I had 10+ reputation) I'm fairly sure you cannot specify a global functions (and global variables) in a localscript. Try putting it into a normal one:

_G["hellomynameisfunction"]=function()
print("WHOA MAN I JUST DID SOMETHING")
end
_G.hellomynameisfunction()

Very simple,

_G["FunctionName"] = function(argument1,argument2)
    print("Code Goes Here Yada Yada")
end

Then to call it, You use...

print("GUYS IMA DO SOMETHING GLOBAL!")
_G.FunctionName("Somethingthere","somethinghere")
print("I Did It")

You could also do something like,

_G["IsOwnerHere"] = function()
is = false
for i,v in pairs(game.Players:children() do
if v.userId == game.CreatorId then
is = true
end
end
return is
end

Then if your in the game

B = _G.IsOwnerHere()
--B = true