I have a LIftmaster security+2.0 unit with an 893LM remote. I want to add another remote unit to the system. Will this unit you show here work with my system? How will I program it so it works along with my existing remote?

This is the correct remote. It comes with instructions on how to program it.

LiftMaster 893LM Security+ 2.0 Remote Garage Door Opener

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Details

LiftMaster 893LM features Security+ 2.0 rolling code technology which changes the code sent to your garage door opener with every use. Features Triband technology which switches between three frequencies to give you the best range. Compatible with LiftMaster MyQ accessories. Includes three button remote, visor clip, battery and instructions. Compatible with LiftMaster models made from 2011 - current that have a round yellow learn button.