[Users] Correct way to use updates-testing?

[Gianluca Cecchi]

Hello,
what should I do to accomplish what in subject?

Also, I currently have fedora 18 and ovirt 3.2.1 (with
ovirt-release-fedora-5-3.noarch).
I see that at http://resources.ovirt.org/releases/ there is also
ovirt-release-fedora-6-1.noarch.rpm
released on 7th of May.

WHat is that for? How to catch it other than manually?
In my current /etc/yum.repos.d/ovirt.repo I don't see any
updates-testing repo to enable....

Thanks in advance,
Gianluca