From the RAD tool, you simply select File-->Export, and choose to export your app as an EAR file, and you EAR is created. There's a few steps, but they're fairly self-explanitory. You choose the project, and the location of where to export the EAR, and you're done.
Here are some WebSphere 5 tutorials on exporting an ear from IRAD (5) deploying an EAR, and even configuring the server. It's WebSphere 5, but the steps are pretty much identical on WebSphere 6 - the screens just change slightly. Just click on the Crazy Lock and Load Deploy link. It'll give you great insight.
I was going to redo all of these for WebSphere 6.1, but though why, seeing that WebSphere 7 would be out soon. I thought that like a year ago.
WebSphere Application Server Admin Tutorials Good luck!
-Cameron McKenzie
[ April 18, 2007: Message edited by: Cameron W. McKenzie ]