[Fizzlemizz]

local h = { "hello", "bye" }
 
local function OnEvent(self, event, ...)
    for key, val in ipairs(h) do
        print(val)
    end
    -- prints:
    -- hello
    -- bye
    -- or:
    print(h[1]) -- prints hello
    print(h[2]) -- prints bye
end
 
local f = CreateFrame("Frame")
f:RegisterEvent("PLAYER_ENTERING_WORLD")
f:SetScript("OnEvent", OnEvent)

That will print hello and bye in your chat frame but only you will be able to see it. If you want to broadcast a message to others in the game like a /say, you would need to use SendChatMessage instead of print.