Wiring Ge Sunsmart Digital Timer To A 3 Way Switch

I am trying to connect the Digital Timer switch to a 3 way switch. My issue is that the existing switch has 4 wires, Red, Black, White and Ground.



The Digital Timer has 5 wires, Red, Black, White, Blue and Ground (green). I can't understand how to connect it. Any help is appreciated.
      


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Hi,



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here's the circuit map as is now:



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