Controlling 10k ohm digital potentiometer IC using NI DAQ USB6001
USB6001 doesn't have hardware support for I2C.  https://forums.ni.com/t5/Multifunction-DAQ/Using-USB-6001-to-implement-SPI-I2C/td-p/3873084?profile.language=en  

I2C isn't tremendously easy to bit-bang, either, because of bidirectional data and clock lines, and clock stretching.  

Wrong tool for the wrong job.  If you're stuck with the USB6001, I suggest matching it to an SPI digital pot.

If you're stuck with both the USB6001 and the I2C pot, my recommendation for robust and fast development is to use the USB6001 to talk to a microcontroller via UART, and use the microcontroller to talk to the pot.