Lucid 3 Key requires updated Java!
1) In the field Features available expand the features you would like to use and check the character state that fits your specimen.
2) In the field Entities remaining, the list of taxa will be progressively eliminated as you check more characters until one last taxon remains.
3) Use the Calculate Best button to have the key suggest the optimal next character.
4) In the field Features chosen you can correct any of your previous choices.