Go to window-info. Then move your mouse over the area you want a spot color, make sure your in CMYK mode the area should be 100K. If not Accurip will print it as a halftone example if it says 85K it will print a 85% halftone. In RGB I think it would be 255R 255G 255B but I always convert to CMYK. Image-mode-CMYK.