First, read the glossary

Second, make your own mental list of terms that are not in the glossary that you think should be.

Third, reply to this with the glossary term and definition you think works well.

Fourth, repeat step 3 for each term you think should be added (that way voting on each definition is individual).

Fifth, upvote glossary definitions you think are good, downvote those which suck balls, and comment on those that you think are close but could be improved.