StatBasics
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Exact significance panel

exactsigpanel

If the assessors are completely unable to detect any difference - and therefore always choose at random - the Exact significance window shows the probability of getting at least the number of correct trials shown in the Frequencies panel, out of the same total number of trials.

If this probability is sufficiently small, we conclude that the assessors are not guessing but are (at least sometimes) detecting some difference between the sample types.

To put it another way, this window shows the exact significance of a directional test of the null hypothesis that all assessors are guessing with the probability of being correct that is specified in the Chance p (rightmost) window in the Task panel.