Error installing and use PyPlot in windows 10 x 64 in julia 0.6.1

New to Julia
22

julia> ENV[“MPLBACKEND”]=“tkagg”
“tkagg”

julia> using PyPlotENV[“MPLBACKEND”]=“tkagg”
ERROR: syntax: “(using PyPlotENV)” is not a valid function argument name

julia> using PyPlot

julia> plot(1:10)
1-element Array{PyCall.PyObject,1}:
PyObject <matplotlib.lines.Line2D object at 0x000000002D806630>

julia> gui()
ERROR: UndefVarError: gui not defined

julia>