Once you have the satellite image, select the cloud height icon on the main display panel. Cloud height determination is based on either the nearest sounding location and time, or a standard atmosphere profile. Use the "Options..." selection to change the default, which is the nearest sounding.
If the selected temperature within the satellite image occurs at more than 1 level in the sounding, the status message box will report that the temperature occurs at multimple levels. The Height box will list each level that the temperature occurs at.