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Unavailable encoder pins on myRIO

I've the program controlling one DC motor using the motor adapter connected on myRIO.

The problem turns out when I try to connect second engine and it turns out that I only have pins DIO18-20, DIO0-2 and DIO4-6 to choose on encoder. But on the NI Motor Adapter the output is connected to pins 19 and 21. I was hoping that I can to change it in file after creating subVI from encoder block. Inside it I see Smart Open block with channels on input and without that I'm not able to change anything. All file looks like a photo and I can only move it.

How can I connect second motor with encoder.

The program with DC motor is in attachment

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