I was unable to create a new ArgoEclipse project to build some UML designs. The "Finish" button remained stubbornly disabled despite my best efforts. Only by chance I realised that you first need to create a regular (non-ArgoEclipse) project first. Nothing explains this while you struggle, naturally. Then your ArgoEclipse project is created "inside".
I had played a bit with ArgoEclipse to make my first UML diagrams. I clicked Save from time to time but only when it had crashed did I realise it wasn't saving at all. A couple of hours wasted work! So if you are a beginner, beware: Save a short bit, then close and re-open, to make sure your setup is just right.
Anyway, the real point of this page is - how do you create an ArgoEclipse Project?
The problem was, when I did File > New > ArgoEclipse Project, the dialog box refused to enable the Finish button, and there weren''t many things to play with:
Instead, do this:

I have never used an application where a project was contained inside another project. Seems a bit hokey to me.