How do you acess the halo reach Beta

In order to access the Halo: Reach beta you first must have:
Halo 3:ODST
An Xbox gold subscription
At least 1 gigabyte of hard-drive space
and an active internet connection
On May3rd the beta will go live and anyone can play, but on May 19 the beta ends so act quickly

The BETA will end either May 17 or like June 3 at the latest.