Kappa coefficient

Hello. I did the least distance (supervised) classification. How do I check the accuracy of the result? (Due to the fact that the kappa coefficient is not supported in this software)

The computation of Kappa is not included in SNAP, but you can compute it yourself following these instructions and the suggestion on how to compute independent accuracy measures based on validation data as described in the last part of this tutorial: Landcover classification with Sentinel-1 GRD (starting at page 26)

I worked on Sentinel 2 images. no problem?

the approach is the same, yes