First let us look at the anatomy of a Peanut M&M (Because it has more parts)

As you can see, there are 3 parts, The Hard candy coating, the creamy chocolate layer, and the peanut center
Now for eating M&M, you will need

M&Ms, Peanut or plain, your choic

A mouth (Teeth only required for peanut M&Ms)
and with that you're all set
Step 1
Open the M&M package.
Step 2
Put the M&M candy in your mouth.
Step 3
DO NOT CHEW THE M&M!!! Respect it, and just let the hard candy coating dissolve.
Step 4
Once the coating has dissolved and you have reached the chocolate layer, savour the chocolate and let it melt in your mouth, and enjoy
If you chose plain, then you are done, but if you chose peanut, proceed to step 5
Step 5
THE PEANUT (sorry no visuals, couldnt find one sad )
really briefly let us look at the peanut, it can be split in two. One half will contain a ball at the end of it, and one half will not. the ball is bitter, so if you don't like it at first, then discard it.
Step 6
Now Eat the Peanut.
With that step complete, you are now finished and have successfully eaten an M&M
Congratulations =)