it has the sandbox editor in the crysis > bin32 folder - if you downloaded through steam it will be there
Once open all you have to do is file > open > navigate to the map you wants .cry file within the maps' folder
Once it has opened, click on entity > triggers > area triggers and drag that onto the map and name it
Then at the top click view > open view pane > flow graph
click on the 'area trigger' you just made in the sidebar of the flow graph window, then again in the flow graph window click file > import > navigate to the EQM xml file which is where you extracted it.
That will import EQM onto the area trigger which is set to trigger for the entire map area.
Then on the main sandbox window click file > export to engine, then file > save
That's it. You can then load the map up from ingame.
However, I personally found EQM made it pretty much unplayable when fighting enemies, so downloaded the 'camera noize' part of the EQM (also found in the EQM link), and imported that xml file instead of the EQM xml file. It still gives a better sense of movement but is actually playable.
@ Centurion, I couldn't remove the slow motion, I did try but to no avail. But as above, the camera noize on its own works best, and you can still use nanosuit functions.