I can't change the properties of a video, help?

comes up with the error: Playing is not a valid member of Part "Workspace.Tv.Video"

Script:

local Remote = script.Parent
local Tv = game.Workspace.Tv

Remote.ClickDetector.MouseClick:Connect(function()
	Tv.Video.Playing = true
end)

I understand videos in Roblox are new and all but this is something you should be able to do...

The Playing property is only there to check if the video is currently playing. To actually play a video you have to use Play(). The correct code for you to use would be:

local Remote = script.Parent
local Tv = game.Workspace.Tv

Remote.ClickDetector.MouseClick:Connect(function()
    Tv.Video:Play()
end)

If you found this answer helpful, I would appreciate it if you accepted it.

Edit: I noticed your path is game.Workspace.Tv which means that you're trying to play a video directly on a part. If you want this to work correctly you need to put a video inside a SurfaceGui