How do I change parts CFrame (rotation, position)?

ok then,

change script to this maybe

local Player = game.Players:WaitForChild("MageMasterHD", 10)

wait ()
while true do
    wait ()
    script.Parent:SetPrimaryPartCFrame(Player.Character.UpperTorso.CFrame)
    script.Parent:SetPrimaryPartCFrame(script.Parent:GetPrimaryPartCFrame() * CFrame.fromEulerAnglesXYZ(0,0.1,0))
end

to (put this in just a script in StarterPlayer>StarterPlayerScripts) XD

Player = script.Parent.Parent--this is the player(or if you only want it to be you then check for it to be your character name):

Player = script.Parent.Parent

wait ()
if Player.Name = "MageMasterHD" then
while true do
    wait ()
    (model).CFrame = Player.Character.Humanoid.Torso.CFrame
    (model).Orientation = (orientation stuff)
end
end

change (model) to the model:FindPrimary stuff, hope this answers your question :)

Extra credit:

just in case you want to ever teleport a character ONLY use humanoid.Torso, its not actualy ssomething in humanoid its a property actualy that is hidden. :)

example:

character).Humanoid.Torso.CFrame = Vector3.new(x,y,z)