C0 and C1 are properties of welds.
C0 = the CFrame of Part0 of the weld
C1 = the CFrame of Part1 of the weld
Try this:
local me = game.Workspace.your90
local w = Instance.new("Weld")
w.Part0 = me.Leg
w.Part1 = me.Head
w.C0 = CFrame.new(me.Leg.CFrame.p)
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