Jehovah's Witnesses…Why doesn't everyone partake of the bread and wine?

If Jesus said to do this in remembrance of him, why only a select few? Where in the Bible does it say to do this, but only if you are one of the "...

If Jesus said to do this in remembrance of him, why only a select few? Where in the Bible does it say to do this, but only if you are one of the "anointed" JWs? Why the exclusion?