First Step make sure your IBM i IWS is up and running go to IBM Navigator for i. This is easiest from IBM i Access Client Solutions or you can just enter the URL in your browser:
http://yourIBMiname:2002/Navigator/mainframe/home
NOTE: other machines I've been on use port 2001 (rather than 2002)

From here was going to the IBM Web Administration for i

Now we are going to create a Web Services Server:

1 - Name your new Webserver

2 - Take note of the Webserver PORT numbers

3 - Define the JOBD for the Server

4 - Define the USER for the Server

5 - And thats it Folks!
Make a note of this information. This tells you everything you need to know about this webserver

Thats it!
We are ready to get testing...