You can click on the Google or Yahoo buttons to sign-in with these identity providers,
or you just type your identity uri and click on the little login button.
see for instance https://www.cubicweb.org/patch/1492318 (https://www.cubicweb.org/versionedfile/1491966)
though some pb may remains
suspect it to be fixed by abfd76fc5499, mark as done
Ticket #1496900 - latest update on 2011/06/20, created on 2011/02/15 by Sylvain Thenault