The fundamental structure of ECCE is a data server and a client. In a standard install, they are on the same machine, and the server automatically starts when you start the client. I will initially ask for a user name and password, which is important if you have a central data server and lots of clients, but if you are running on a single machine, just enter some simple password. The data server stores your input and output files, and coordinates the running of jobs.
Separate from all of that are compute servers. One of the powerful features of ECCE is that it is as easy to run jobs on remote computers as it is to run them locally. If you only run local calculations, it will automatically create a definition for your local machine, and you can run things that way.
If you continue to need help, feel free to contact my directly, and I can help more.