The easiest way to install EWD is to use the M/DB Installer for Ubuntu Linux. Click on the EWD or M/DB Download tabs, select the Installer tab and follow the instructions. You'll have a fully working, fully configured system up and running in just a few minutes.
Alternatively watch the video: Installing M/DB: Part 1. At the end of the steps shown in this short video, you'll have a fully operational version of EWD up and running and ready to use.
Once you've installed EWD, follow the standard instructions on this web site for using EWD.