Update 19 June 2013:
A much better written and complete guide to getting started with MD in ECCE+NWChem is found here: http://saccharides.blogspot.tw/2013/06/ecce-md-calculation.html
Original post:
Part 1:
http://verahill.blogspot.com.au/2012/05/md-ecce-nwchem-1-prepare.html
Part 2:
http://verahill.blogspot.com.au/2012/05/md-ecce-nwchem-2-md-optimize.html
Part 4.
http://verahill.blogspot.com.au/2012/05/md-ecce-nwchem-4dynamics.html
Rightclick and select new, Energy
Double-click on the new icon
Click on editor
Set up your calc, then launch
It should run quickly. There's little to see in terms of output except for single-point energies.