Hello,
Do you see the signal using Measurement and Automation Explorer? If you do, you can double check that your code has the necessary function calls for doing analog input. In general you would use:
Init_DA_Brds (Board, &BoardCode);
MIO_Config;
AI_Configure;
SCAN_Setup;
AI_VRead_Scan;
You can also try to read the voltages using Scan_OP or Scan_Start.
Good luck with your project!