how is the link?
Age of Empires is still in closed beta. There is no way to access the beta unless you get selected to be a tester.
How can I get invite for beta?
As @Memes B Dreams said the game still in closed beta, you must wait for the e-mail to become a beta tester. So far the beta test hasn't started for players community.
By the way ("Spanish"): Bienvenido a los foros
Here's the link you need (click)