The Mac version of BB2016 does not include RB, as I recall.

There are great tutorials on compressors on YouTube or recording sites. Fellow forumite, Mac, wrote a very comprehensive article on compression that I will find for you if you don't have success in finding your answers.

I usually record a separate vocal track dry then do microsurgery in a DAW (Even Audacity (free)) does a nice job. Certainly RB would do fine.

Basic compression guide:

http://www.homestudiocenter.com/how-to-use-a-compressor-plus-10-top-tips/