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ADL5243  USB coding question

I bought the ADL5243 ADI assessment board, but when I tested the board ,I encountered problems. The board of digital attenuator (DSA) attenuation coefficient does not change when adjusting  software, I want to ask my USB programming is out of the question? Should I always connect the board to the computer? Do you need to connect to the other pins in addition to connecting the 5V power to the VDD pin? Need  I  weld other capacitance or resistance to the board?