Animation Loop (build in animation system)

I've only used Unity for 4 hours so exuse me if my question is trivial.

I have a cube rotating using the build-in animation system. How can I make it loop?

I searched for it on the net and there seems to be a Wrap Mode property when you import animations but I can't seem to find this property with the build in animation system.

Thanks.

Are you talking about the Animation View? Have you seen the section about Wrap Mode on this page?