[Trying to see how instance.new works but why does the = in the if then function have a red line?

[SOLVED] (theres no room in the title :() The error: expecting then when parsing =

The script in serverscriptservice:

local Frame = Instance.new("Frame")
local ScreenGui = Instance.new("ScreenGui")
local StarterGui =  game.StarterGui
ScreenGui.Parent = StarterGui
Frame.Parent = ScreenGui
if Frame.Visible = false then
	Frame.Visible = true
end